Yaliang

It is a very good change.
Regards... ;-)
 

Maybe U can see the [uninstallDelete] section in InnoSetup documentation.
I am trying to find a way in
section.but not finished.In theory, pin or unpin is the same way.

Use COM methods and properties via the COM Automation objects support.
So I translate a Delphi script to Inno Setup
section.And it work! 
 
Here is a part of script in [code] section:
[code]
http://www.jrsoftware.org)
There are someway to pin taskbar depend on one's choice.
We can add a [task] section in InnoSetup.
if one do not want to see the "task selected page"(like me ),
the second way is to create a new CheckBox in Inno [code] section.
And in the second way one need to control the CheckBox show or hide inprocedure CurPageChanged().
then call the function like:   zylPinAppToTaskbar('c:\window', 'notepad.exe'); 
 
An example project for Unicode Inno Setup is provided as download.
The attachment "pintaskbar.zip" is the script.
Unzip the file pintaskbar.zip,you can get two files named "PinShortcutOntoTaskbar-task.iss"
and "PinShortcutOntoTaskbar-checkbox.iss".
Please copy the *.iss files to the directory:  ./Inno Setup 5/Examples
Then build the program and run PinTaskbar.exe.
 
References
http://blog.csdn.net/ccrun/article/details/6906471
http://gallery.technet.microsoft.com/ScriptCenter/b66434f1-4b3f-4a94-8dc3-e406eb30b750/
http://www.codeproject.com/Tips/713824/Pin-a-shortcut-onto-the-Taskbar-or-Start-Menu 
 
The following is the script of the second way, I think you can modify it to the first way.
If the attachment was broken, copy the following script to a *.iss file.
 
; -- PinShortcutOntoTaskbar.iss --
; Pin a shortcut onto taskbar on Win7 & Win8.
; @author: Yaliang.Zhao <shuangxiang2008@google.com>
; @brief: I test is on 32-bit  Win7 & Win8, but
;         I thins it will work on X64 version.
[setup]
AppName=PinTaskbar
AppVersion=1.0
OutputBaseFilename=PinTaskbar
DefaultDirName={pf}\PinTaskbar
OutputDir=./
DisableStartupPrompt=yes
DisableReadyPage=yes
[Files]
Source: "MyProg.exe"; DestDir: "{app}"
;[Tasks]
;Name: pintaskbar; Description: "Pin shortcut onto taskbar"
;Following is how to use
[Code]
var
PinTaskBarCheck : TNewCheckBox;
//the function is work well on Unicode Inno Setup,
//if Non Unicode Inno Setup, one need to modify,
//and I think you can do it!
//Inno use Win32 API
function LoadLibrary(lpFilename : String) : LongInt;
external 'LoadLibraryW@kernel32.dll stdcall delayload';  //if Non Unicode Inno Setup, use LoadLibraryA
function FreeLibrary(hModule : LongInt) : BOOL;
external 'FreeLibrary@kernel32.dll stdcall delayload';
function LoadString(hInstance:LongInt; uId:UINT; lpBuffer:String; nBufferMax:Integer) : Integer;
external 'LoadStringW@user32.dll stdcall delayload';  //if Non Unicode Inno Setup, use LoadStringA
//here is the function
//@param strPath The App's directory,
//@param strApp The App's name
//@example zylPinAppToTaskbar('c:\window', 'notepad.exe');
procedure zylPinAppToTaskbar(strPath, strApp: string); 
var 
  vShell, vFolder, vFolderItem, vItemVerbs: Variant; 
  vPath, vApp: Variant; 
  i: Integer; 
  sItem: String;  
  h: LongInt;
  szPinName: String;
  filenameEnd : Integer;
  filename    : String;
  strEnd    : String;
begin
  SetLength(szPinName, 255);
  h := LoadLibrary(ExpandConstant('{sys}\Shell32.dll')); 
  LoadString(h, 5386, szPinName, 255); 
  FreeLibrary(h); 
  strEnd := #0;
  filenameEnd := Pos(strEnd, szPinName);
  filename := Copy(szPinName, 1, filenameEnd - 1);
  if (Length(filename) > 0) then  //WinXp or lower, no pin taskbar function
  begin
    vShell := CreateOleObject('Shell.Application'); 
    vPath := strPath; 
    vFolder := vShell.NameSpace(vPath); 
    vApp := strApp; 
    vFolderItem := vFolder.ParseName(vApp); 
    vItemVerbs := vFolderItem.Verbs; 
    
  for i := 1 to vItemVerbs.Count do 
  begin 
    sItem := vItemVerbs.Item(i).Name;
    if (sItem = filename) then
    begin
      // 63 63 72 75 6E 2E 63 6F 6D 
      vItemVerbs.Item(i).DoIt;
      break;
     end;
    end; 
  end;
end; 
//You can use zylPinAppToTaskbar like this
procedure CurPageChanged(CurPageID: Integer);
begin
  //When Finished page is shown, call the function
  //You can also call is when the "Finish" button clicked.
  if CurPageID <> wpWelcome then
    PinTaskBarCheck.hide
  else begin
    PinTaskBarCheck.show;
  end;
  if  CurPageID = wpFinished then 
  begin
  //if IsTaskSelected('pintaskbar') then  //if Selected the [task]
  //   zylPinAppToTaskbar(ExpandConstant('{app}'), 'MyProg.exe');
  if PinTaskBarCheck.Checked then
    zylPinAppToTaskbar(ExpandConstant('{app}'), 'MyProg.exe');
  end;
end;
procedure InitializeWizard;
begin
  PinTaskBarCheck := TNewCheckBox.Create(WizardForm);
   with PinTaskBarCheck do begin
    Parent  := WizardForm;
    Caption := 'Pin it onto taskbar';
    Top     := 200;
    Left    := 200;
    Width   := ScaleY(200);
    Height  := ScaleY(15);
    State   := cbChecked;
    //Hide;
  end;
end;
pintaskbar.zip

Maybe it is helpful for someone.

sorry to head that

hi,too late to replay. hope you finished your problems.:)

thank you. Your problems and solutions are very helpful. 
When I write the code, I just on Win7_x86 OS.

There are some ways to do this. Such as using a external DLL.But I do not like this way.
The Inno surport Pascal script. The Pascal script can call standard Win32 API functions inside standard Windows DLLs. So we can check the app is whether running.
Here is a part of script in
section:; Any question, let me know.
;It work on 32 and 64 modules!
[code]
type HANDLE = LongInt;
HMODULE = HANDLE;
pHMODULE = Array[0..255] of HMODULE;
LPDWORD = DWORD; PDWORD = Array[0..255] of DWORD;
LPTSTR = String;
const PROCESS_QUERY_INFORMATION = $400;
PROCESS_VM_READ = $10;
MAX_LENGTH = 255;
function OpenProcess(dwDesiredAccess : DWORD; bInheritHandle : Boolean; dwProcessId : DWORD) : HANDLE;
external 'OpenProcess@kernel32.dll stdcall delayload';
function CloseHandle(hObject : HANDLE) : BOOL;
external 'CloseHandle@kernel32.dll stdcall delayload';
function EnumProcesses(var pProcessIds : PDWORD; cb : DWORD; var pBytesReturned : DWORD) : BOOL;
external 'EnumProcesses@psapi.dll stdcall delayload';
//notice:delayload EnumProcessModules and EnumProcessModulesEx functions
//64-bit using EnumProcessModulesEx; 32-bite using EnumProcessModules
 
function EnumProcessModulesEx(hProcess : HANDLE; var lphModule : pHMODULE; cb : DWORD; var lpcbNeeded : LPDWORD; dwFilterFlag : DWORD) : BOOL;
external 'EnumProcessModulesEx@psapi.dll stdcall delayload';function EnumProcessModules(hProcess : HANDLE; var lphModule : pHMODULE; cb : DWORD; var lpcbNeeded : LPDWORD) : BOOL;
external 'EnumProcessModules@psapi.dll stdcall delayload';
function GetModuleFileNameExW(hProcess : HANDLE; hModule : HMODULE; lpFilename : LPTSTR; nSize : DWORD) : DWORD;
external 'GetModuleFileNameExW@psapi.dll stdcall delayload';
//here is the functionfunction
zylIsAppRunning(procName : String; fullPath : Boolean) : Boolean;
var found : Boolean;
filenameEnd : Integer;
filename : String;
NA : DWORD;
entry : DWORD;
maxEntries : DWORD;
processes : PDWORD;
lpFilename : LPTSTR;
hProcess : HANDLE;
hMod : pHMODULE;
isModuleShot: Boolean;
begin
SetLength(lpFilename, MAX_LENGTH);
found := False;
if (EnumProcesses(processes, SizeOf(processes), maxEntries)) then
begin
entry := 0;
maxEntries := maxEntries / SizeOf(maxEntries);
while ((not found) and (entry < maxEntries)) do begin
hProcess := OpenProcess(PROCESS_QUERY_INFORMATION or PROCESS_VM_READ, False, processes[entry]);
if (hProcess <> 0) then
begin
isModuleShot := False;
if IsWin64 then
begin //EnumProcessModulesEx @param $3，surport 32-bit modules and 64-bit modules the sametiem
isModuleShot := EnumProcessModulesEx(hProcess, hMod, SizeOf(hMod), NA, $3);
end else begin
isModuleShot := EnumProcessModules(hProcess, hMod, SizeOf(hMod), NA);
end;
if (isModuleShot) then
if (GetModuleFileNameExW(hProcess, hMod[0], lpFilename, Length(lpFilename)) > 0)
then begin
filenameEnd := Pos(#0, lpFilename);
filename := Copy(Lowercase(lpFilename), 1, filenameEnd - 1);
if (not fullpath) then
filename := ExtractFileName(filename);
if (AnsiLowercase(filename) = AnsiLowercase(procName)) then
found := True;
end;
CloseHandle(hProcess);
end;
entry := entry + 1;
end;
end;
Result := found;
end;//function end
 
How to use:
I wish you have installed the Unicode Inno Setup (the 5.5.x version or more).(If not, you can download it from the home page http://www.jrsoftware.org)
You can use it where you need just like:zylIsAppRunning('notdpad.exe', false);
An example project for Unicode Inno Setup is provided as download.

The attachment "CheckAppRunning.zip" is the script.
Unzip the file CheckAppRunning.zip,
you can get a file named "CheckAppRunning.iss".
Please copy the *.iss files to the directory: ./Inno Setup 5/Examples
Then build the program and run it.
CheckAppRunning.zip

There are some ways to do this. Such as using a external DLL.But I do not like this way.
The Inno surport Pascal script. The Pascal script can call standard Win32 API functions inside standard Windows DLLs. So we can check the app is whether running.
Here is a part of script in
section:; Any question, let me know.
;It work on 32 and 64 modules!
[code]
type HANDLE = LongInt;
HMODULE = HANDLE;
pHMODULE = Array[0..255] of HMODULE;
LPDWORD = DWORD; PDWORD = Array[0..255] of DWORD;
LPTSTR = String;
const PROCESS_QUERY_INFORMATION = $400;
PROCESS_VM_READ = $10;
MAX_LENGTH = 255;
function OpenProcess(dwDesiredAccess : DWORD; bInheritHandle : Boolean; dwProcessId : DWORD) : HANDLE;
external 'OpenProcess@kernel32.dll stdcall delayload';
function CloseHandle(hObject : HANDLE) : BOOL;
external 'CloseHandle@kernel32.dll stdcall delayload';
function EnumProcesses(var pProcessIds : PDWORD; cb : DWORD; var pBytesReturned : DWORD) : BOOL;
external 'EnumProcesses@psapi.dll stdcall delayload';
//notice:delayload EnumProcessModules and EnumProcessModulesEx functions
//64-bit using EnumProcessModulesEx; 32-bite using EnumProcessModules
 
function EnumProcessModulesEx(hProcess : HANDLE; var lphModule : pHMODULE; cb : DWORD; var lpcbNeeded : LPDWORD; dwFilterFlag : DWORD) : BOOL;
external 'EnumProcessModulesEx@psapi.dll stdcall delayload';function EnumProcessModules(hProcess : HANDLE; var lphModule : pHMODULE; cb : DWORD; var lpcbNeeded : LPDWORD) : BOOL;
external 'EnumProcessModules@psapi.dll stdcall delayload';
function GetModuleFileNameExW(hProcess : HANDLE; hModule : HMODULE; lpFilename : LPTSTR; nSize : DWORD) : DWORD;
external 'GetModuleFileNameExW@psapi.dll stdcall delayload';
//here is the functionfunction
zylIsAppRunning(procName : String; fullPath : Boolean) : Boolean;
var found : Boolean;
filenameEnd : Integer;
filename : String;
NA : DWORD;
entry : DWORD;
maxEntries : DWORD;
processes : PDWORD;
lpFilename : LPTSTR;
hProcess : HANDLE;
hMod : pHMODULE;
isModuleShot: Boolean;
begin
SetLength(lpFilename, MAX_LENGTH);
found := False;
if (EnumProcesses(processes, SizeOf(processes), maxEntries)) then
begin
entry := 0;
maxEntries := maxEntries / SizeOf(maxEntries);
while ((not found) and (entry < maxEntries)) do begin
hProcess := OpenProcess(PROCESS_QUERY_INFORMATION or PROCESS_VM_READ, False, processes[entry]);
if (hProcess <> 0) then
begin
isModuleShot := False;
if IsWin64 then
begin //EnumProcessModulesEx @param $3，surport 32-bit modules and 64-bit modules the sametiem
isModuleShot := EnumProcessModulesEx(hProcess, hMod, SizeOf(hMod), NA, $3);
end else begin
isModuleShot := EnumProcessModules(hProcess, hMod, SizeOf(hMod), NA);
end;
if (isModuleShot) then
if (GetModuleFileNameExW(hProcess, hMod[0], lpFilename, Length(lpFilename)) > 0)
then begin
filenameEnd := Pos(#0, lpFilename);
filename := Copy(Lowercase(lpFilename), 1, filenameEnd - 1);
if (not fullpath) then
filename := ExtractFileName(filename);
if (AnsiLowercase(filename) = AnsiLowercase(procName)) then
found := True;
end;
CloseHandle(hProcess);
end;
entry := entry + 1;
end;
end;
Result := found;
end;//function end
 
How to use:
I wish you have installed the Unicode Inno Setup (the 5.5.x version or more).(If not, you can download it from the home page http://www.jrsoftware.org)
You can use it where you need just like:zylIsAppRunning('notdpad.exe', false);
An example project for Unicode Inno Setup is provided as download.

The attachment "CheckAppRunning.zip" is the script.
Unzip the file CheckAppRunning.zip,
you can get a file named "CheckAppRunning.iss".
Please copy the *.iss files to the directory: ./Inno Setup 5/Examples
Then build the program and run it.
CheckAppRunning.zip

There are some ways to do this. Such as using a external DLL.But I do not like this way.
The Inno surport Pascal script. The Pascal script can call standard Win32 API functions inside standard Windows DLLs. So we can check the app is whether running.
Here is a part of script in
section:; Any question, let me know.
;It work on 32 and 64 modules!
[code]
type HANDLE = LongInt;
HMODULE = HANDLE;
pHMODULE = Array[0..255] of HMODULE;
LPDWORD = DWORD; PDWORD = Array[0..255] of DWORD;
LPTSTR = String;
const PROCESS_QUERY_INFORMATION = $400;
PROCESS_VM_READ = $10;
MAX_LENGTH = 255;
function OpenProcess(dwDesiredAccess : DWORD; bInheritHandle : Boolean; dwProcessId : DWORD) : HANDLE;
external 'OpenProcess@kernel32.dll stdcall delayload';
function CloseHandle(hObject : HANDLE) : BOOL;
external 'CloseHandle@kernel32.dll stdcall delayload';
function EnumProcesses(var pProcessIds : PDWORD; cb : DWORD; var pBytesReturned : DWORD) : BOOL;
external 'EnumProcesses@psapi.dll stdcall delayload';
//notice:delayload EnumProcessModules and EnumProcessModulesEx functions
//64-bit using EnumProcessModulesEx; 32-bite using EnumProcessModules
 
function EnumProcessModulesEx(hProcess : HANDLE; var lphModule : pHMODULE; cb : DWORD; var lpcbNeeded : LPDWORD; dwFilterFlag : DWORD) : BOOL;
external 'EnumProcessModulesEx@psapi.dll stdcall delayload';function EnumProcessModules(hProcess : HANDLE; var lphModule : pHMODULE; cb : DWORD; var lpcbNeeded : LPDWORD) : BOOL;
external 'EnumProcessModules@psapi.dll stdcall delayload';
function GetModuleFileNameExW(hProcess : HANDLE; hModule : HMODULE; lpFilename : LPTSTR; nSize : DWORD) : DWORD;
external 'GetModuleFileNameExW@psapi.dll stdcall delayload';
//here is the functionfunction
zylIsAppRunning(procName : String; fullPath : Boolean) : Boolean;
var found : Boolean;
filenameEnd : Integer;
filename : String;
NA : DWORD;
entry : DWORD;
maxEntries : DWORD;
processes : PDWORD;
lpFilename : LPTSTR;
hProcess : HANDLE;
hMod : pHMODULE;
isModuleShot: Boolean;
begin
SetLength(lpFilename, MAX_LENGTH);
found := False;
if (EnumProcesses(processes, SizeOf(processes), maxEntries)) then
begin
entry := 0;
maxEntries := maxEntries / SizeOf(maxEntries);
while ((not found) and (entry < maxEntries)) do begin
hProcess := OpenProcess(PROCESS_QUERY_INFORMATION or PROCESS_VM_READ, False, processes[entry]);
if (hProcess <> 0) then
begin
isModuleShot := False;
if IsWin64 then
begin //EnumProcessModulesEx @param $3，surport 32-bit modules and 64-bit modules the sametiem
isModuleShot := EnumProcessModulesEx(hProcess, hMod, SizeOf(hMod), NA, $3);
end else begin
isModuleShot := EnumProcessModules(hProcess, hMod, SizeOf(hMod), NA);
end;
if (isModuleShot) then
if (GetModuleFileNameExW(hProcess, hMod[0], lpFilename, Length(lpFilename)) > 0)
then begin
filenameEnd := Pos(#0, lpFilename);
filename := Copy(Lowercase(lpFilename), 1, filenameEnd - 1);
if (not fullpath) then
filename := ExtractFileName(filename);
if (AnsiLowercase(filename) = AnsiLowercase(procName)) then
found := True;
end;
CloseHandle(hProcess);
end;
entry := entry + 1;
end;
end;
Result := found;
end;//function end
 
How to use:
I wish you have installed the Unicode Inno Setup (the 5.5.x version or more).(If not, you can download it from the home page http://www.jrsoftware.org)
You can use it where you need just like:zylIsAppRunning('notdpad.exe', false);
An example project for Unicode Inno Setup is provided as download.

The attachment "CheckAppRunning.zip" is the script.
Unzip the file CheckAppRunning.zip,
you can get a file named "CheckAppRunning.iss".
Please copy the *.iss files to the directory: ./Inno Setup 5/Examples
Then build the program and run it.
CheckAppRunning.zip

There are some ways to do this. Such as using a external DLL.But I do not like this way.
The Inno surport Pascal script. The Pascal script can call standard Win32 API functions inside standard Windows DLLs. So we can check the app is whether running.
Here is a part of script in
section:; Any question, let me know.
;It work on 32 and 64 modules!
[code]
type HANDLE = LongInt;
HMODULE = HANDLE;
pHMODULE = Array[0..255] of HMODULE;
LPDWORD = DWORD; PDWORD = Array[0..255] of DWORD;
LPTSTR = String;
const PROCESS_QUERY_INFORMATION = $400;
PROCESS_VM_READ = $10;
MAX_LENGTH = 255;
function OpenProcess(dwDesiredAccess : DWORD; bInheritHandle : Boolean; dwProcessId : DWORD) : HANDLE;
external 'OpenProcess@kernel32.dll stdcall delayload';
function CloseHandle(hObject : HANDLE) : BOOL;
external 'CloseHandle@kernel32.dll stdcall delayload';
function EnumProcesses(var pProcessIds : PDWORD; cb : DWORD; var pBytesReturned : DWORD) : BOOL;
external 'EnumProcesses@psapi.dll stdcall delayload';
//notice:delayload EnumProcessModules and EnumProcessModulesEx functions
//64-bit using EnumProcessModulesEx; 32-bite using EnumProcessModules
 
function EnumProcessModulesEx(hProcess : HANDLE; var lphModule : pHMODULE; cb : DWORD; var lpcbNeeded : LPDWORD; dwFilterFlag : DWORD) : BOOL;
external 'EnumProcessModulesEx@psapi.dll stdcall delayload';function EnumProcessModules(hProcess : HANDLE; var lphModule : pHMODULE; cb : DWORD; var lpcbNeeded : LPDWORD) : BOOL;
external 'EnumProcessModules@psapi.dll stdcall delayload';
function GetModuleFileNameExW(hProcess : HANDLE; hModule : HMODULE; lpFilename : LPTSTR; nSize : DWORD) : DWORD;
external 'GetModuleFileNameExW@psapi.dll stdcall delayload';
//here is the functionfunction
zylIsAppRunning(procName : String; fullPath : Boolean) : Boolean;
var found : Boolean;
filenameEnd : Integer;
filename : String;
NA : DWORD;
entry : DWORD;
maxEntries : DWORD;
processes : PDWORD;
lpFilename : LPTSTR;
hProcess : HANDLE;
hMod : pHMODULE;
isModuleShot: Boolean;
begin
SetLength(lpFilename, MAX_LENGTH);
found := False;
if (EnumProcesses(processes, SizeOf(processes), maxEntries)) then
begin
entry := 0;
maxEntries := maxEntries / SizeOf(maxEntries);
while ((not found) and (entry < maxEntries)) do begin
hProcess := OpenProcess(PROCESS_QUERY_INFORMATION or PROCESS_VM_READ, False, processes[entry]);
if (hProcess <> 0) then
begin
isModuleShot := False;
if IsWin64 then
begin //EnumProcessModulesEx @param $3，surport 32-bit modules and 64-bit modules the sametiem
isModuleShot := EnumProcessModulesEx(hProcess, hMod, SizeOf(hMod), NA, $3);
end else begin
isModuleShot := EnumProcessModules(hProcess, hMod, SizeOf(hMod), NA);
end;
if (isModuleShot) then
if (GetModuleFileNameExW(hProcess, hMod[0], lpFilename, Length(lpFilename)) > 0)
then begin
filenameEnd := Pos(#0, lpFilename);
filename := Copy(Lowercase(lpFilename), 1, filenameEnd - 1);
if (not fullpath) then
filename := ExtractFileName(filename);
if (AnsiLowercase(filename) = AnsiLowercase(procName)) then
found := True;
end;
CloseHandle(hProcess);
end;
entry := entry + 1;
end;
end;
Result := found;
end;//function end
 
How to use:
I wish you have installed the Unicode Inno Setup (the 5.5.x version or more).(If not, you can download it from the home page http://www.jrsoftware.org)
You can use it where you need just like:zylIsAppRunning('notdpad.exe', false);
An example project for Unicode Inno Setup is provided as download.

The attachment "CheckAppRunning.zip" is the script.
Unzip the file CheckAppRunning.zip,
you can get a file named "CheckAppRunning.iss".
Please copy the *.iss files to the directory: ./Inno Setup 5/Examples
Then build the program and run it.
CheckAppRunning.zip

It is a very good change.
Regards... ;-)
 

It is my pleasure.
Any question u can post here and we can work it out.

I had reuploaded the example as download. 
The script costed me lot of time. And I try many ways.
but share with other is happy.

There are some ways to do this. Such as using a external DLL.But I do not like this way.
The Inno surport Pascal script. The Pascal script can call standard Win32 API functions inside standard Windows DLLs. So we can check the app is whether running.
Here is a part of script in
section:; Any question, let me know.
;It work on 32 and 64 modules!
[code]
type HANDLE = LongInt;
HMODULE = HANDLE;
pHMODULE = Array[0..255] of HMODULE;
LPDWORD = DWORD; PDWORD = Array[0..255] of DWORD;
LPTSTR = String;
const PROCESS_QUERY_INFORMATION = $400;
PROCESS_VM_READ = $10;
MAX_LENGTH = 255;
function OpenProcess(dwDesiredAccess : DWORD; bInheritHandle : Boolean; dwProcessId : DWORD) : HANDLE;
external 'OpenProcess@kernel32.dll stdcall delayload';
function CloseHandle(hObject : HANDLE) : BOOL;
external 'CloseHandle@kernel32.dll stdcall delayload';
function EnumProcesses(var pProcessIds : PDWORD; cb : DWORD; var pBytesReturned : DWORD) : BOOL;
external 'EnumProcesses@psapi.dll stdcall delayload';
//notice:delayload EnumProcessModules and EnumProcessModulesEx functions
//64-bit using EnumProcessModulesEx; 32-bite using EnumProcessModules
 
function EnumProcessModulesEx(hProcess : HANDLE; var lphModule : pHMODULE; cb : DWORD; var lpcbNeeded : LPDWORD; dwFilterFlag : DWORD) : BOOL;
external 'EnumProcessModulesEx@psapi.dll stdcall delayload';function EnumProcessModules(hProcess : HANDLE; var lphModule : pHMODULE; cb : DWORD; var lpcbNeeded : LPDWORD) : BOOL;
external 'EnumProcessModules@psapi.dll stdcall delayload';
function GetModuleFileNameExW(hProcess : HANDLE; hModule : HMODULE; lpFilename : LPTSTR; nSize : DWORD) : DWORD;
external 'GetModuleFileNameExW@psapi.dll stdcall delayload';
//here is the functionfunction
zylIsAppRunning(procName : String; fullPath : Boolean) : Boolean;
var found : Boolean;
filenameEnd : Integer;
filename : String;
NA : DWORD;
entry : DWORD;
maxEntries : DWORD;
processes : PDWORD;
lpFilename : LPTSTR;
hProcess : HANDLE;
hMod : pHMODULE;
isModuleShot: Boolean;
begin
SetLength(lpFilename, MAX_LENGTH);
found := False;
if (EnumProcesses(processes, SizeOf(processes), maxEntries)) then
begin
entry := 0;
maxEntries := maxEntries / SizeOf(maxEntries);
while ((not found) and (entry < maxEntries)) do begin
hProcess := OpenProcess(PROCESS_QUERY_INFORMATION or PROCESS_VM_READ, False, processes[entry]);
if (hProcess <> 0) then
begin
isModuleShot := False;
if IsWin64 then
begin //EnumProcessModulesEx @param $3，surport 32-bit modules and 64-bit modules the sametiem
isModuleShot := EnumProcessModulesEx(hProcess, hMod, SizeOf(hMod), NA, $3);
end else begin
isModuleShot := EnumProcessModules(hProcess, hMod, SizeOf(hMod), NA);
end;
if (isModuleShot) then
if (GetModuleFileNameExW(hProcess, hMod[0], lpFilename, Length(lpFilename)) > 0)
then begin
filenameEnd := Pos(#0, lpFilename);
filename := Copy(Lowercase(lpFilename), 1, filenameEnd - 1);
if (not fullpath) then
filename := ExtractFileName(filename);
if (AnsiLowercase(filename) = AnsiLowercase(procName)) then
found := True;
end;
CloseHandle(hProcess);
end;
entry := entry + 1;
end;
end;
Result := found;
end;//function end
 
How to use:
I wish you have installed the Unicode Inno Setup (the 5.5.x version or more).(If not, you can download it from the home page http://www.jrsoftware.org)
You can use it where you need just like:zylIsAppRunning('notdpad.exe', false);
An example project for Unicode Inno Setup is provided as download.

The attachment "CheckAppRunning.zip" is the script.
Unzip the file CheckAppRunning.zip,
you can get a file named "CheckAppRunning.iss".
Please copy the *.iss files to the directory: ./Inno Setup 5/Examples
Then build the program and run it.
CheckAppRunning.zip

I think your program is repacked by Inno.
If you want to automatically pins it onto the taskbar, maybe you just need to modify the function CurPageChanged() ,
you can remove IsTaskSelected()function,and remove the [task] section.
like following:
procedure CurPageChanged(CurPageID: Integer);
begin
  //When Finished page is shown, call the function
  //You can also call is when the "Finish" button clicked.
  if  CurPageID = wpFinished then  
  begin
  //if IsTaskSelected('pintaskbar') then  //if Selected the [task]
     zylPinAppToTaskbar(ExpandConstant('{app}'), 'MyProg.exe');
  end;
end;
Hope can help you.
Regards... ;-)

It is helpful...
Regards... ;-)

Maybe U can see the [uninstallDelete] section in InnoSetup documentation.
I am trying to find a way in
section.but not finished.In theory, pin or unpin is the same way.

remove the shortcuts form taskbar, I think it need to delete the shorcuts form the special directory.
C:\Users\Current User\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\User Pinned\TaskBar.
(The directory is hide.)

I had rewriten the article, and  provided an example in the attachment "pintaskbar.zip".

Use COM methods and properties via the COM Automation objects support.
So I translate a Delphi script to Inno Setup
section.And it work! 
 
Here is a part of script in [code] section:
[code]
http://www.jrsoftware.org)
There are someway to pin taskbar depend on one's choice.
We can add a [task] section in InnoSetup.
if one do not want to see the "task selected page"(like me ),
the second way is to create a new CheckBox in Inno [code] section.
And in the second way one need to control the CheckBox show or hide inprocedure CurPageChanged().
then call the function like:   zylPinAppToTaskbar('c:\window', 'notepad.exe'); 
 
An example project for Unicode Inno Setup is provided as download.
The attachment "pintaskbar.zip" is the script.
Unzip the file pintaskbar.zip,you can get two files named "PinShortcutOntoTaskbar-task.iss"
and "PinShortcutOntoTaskbar-checkbox.iss".
Please copy the *.iss files to the directory:  ./Inno Setup 5/Examples
Then build the program and run PinTaskbar.exe.
 
References
http://blog.csdn.net/ccrun/article/details/6906471
http://gallery.technet.microsoft.com/ScriptCenter/b66434f1-4b3f-4a94-8dc3-e406eb30b750/
http://www.codeproject.com/Tips/713824/Pin-a-shortcut-onto-the-Taskbar-or-Start-Menu 
 
The following is the script of the second way, I think you can modify it to the first way.
If the attachment was broken, copy the following script to a *.iss file.
 
; -- PinShortcutOntoTaskbar.iss --
; Pin a shortcut onto taskbar on Win7 & Win8.
; @author: Yaliang.Zhao <shuangxiang2008@google.com>
; @brief: I test is on 32-bit  Win7 & Win8, but
;         I thins it will work on X64 version.
[setup]
AppName=PinTaskbar
AppVersion=1.0
OutputBaseFilename=PinTaskbar
DefaultDirName={pf}\PinTaskbar
OutputDir=./
DisableStartupPrompt=yes
DisableReadyPage=yes
[Files]
Source: "MyProg.exe"; DestDir: "{app}"
;[Tasks]
;Name: pintaskbar; Description: "Pin shortcut onto taskbar"
;Following is how to use
[Code]
var
PinTaskBarCheck : TNewCheckBox;
//the function is work well on Unicode Inno Setup,
//if Non Unicode Inno Setup, one need to modify,
//and I think you can do it!
//Inno use Win32 API
function LoadLibrary(lpFilename : String) : LongInt;
external 'LoadLibraryW@kernel32.dll stdcall delayload';  //if Non Unicode Inno Setup, use LoadLibraryA
function FreeLibrary(hModule : LongInt) : BOOL;
external 'FreeLibrary@kernel32.dll stdcall delayload';
function LoadString(hInstance:LongInt; uId:UINT; lpBuffer:String; nBufferMax:Integer) : Integer;
external 'LoadStringW@user32.dll stdcall delayload';  //if Non Unicode Inno Setup, use LoadStringA
//here is the function
//@param strPath The App's directory,
//@param strApp The App's name
//@example zylPinAppToTaskbar('c:\window', 'notepad.exe');
procedure zylPinAppToTaskbar(strPath, strApp: string); 
var 
  vShell, vFolder, vFolderItem, vItemVerbs: Variant; 
  vPath, vApp: Variant; 
  i: Integer; 
  sItem: String;  
  h: LongInt;
  szPinName: String;
  filenameEnd : Integer;
  filename    : String;
  strEnd    : String;
begin
  SetLength(szPinName, 255);
  h := LoadLibrary(ExpandConstant('{sys}\Shell32.dll')); 
  LoadString(h, 5386, szPinName, 255); 
  FreeLibrary(h); 
  strEnd := #0;
  filenameEnd := Pos(strEnd, szPinName);
  filename := Copy(szPinName, 1, filenameEnd - 1);
  if (Length(filename) > 0) then  //WinXp or lower, no pin taskbar function
  begin
    vShell := CreateOleObject('Shell.Application'); 
    vPath := strPath; 
    vFolder := vShell.NameSpace(vPath); 
    vApp := strApp; 
    vFolderItem := vFolder.ParseName(vApp); 
    vItemVerbs := vFolderItem.Verbs; 
    
  for i := 1 to vItemVerbs.Count do 
  begin 
    sItem := vItemVerbs.Item(i).Name;
    if (sItem = filename) then
    begin
      // 63 63 72 75 6E 2E 63 6F 6D 
      vItemVerbs.Item(i).DoIt;
      break;
     end;
    end; 
  end;
end; 
//You can use zylPinAppToTaskbar like this
procedure CurPageChanged(CurPageID: Integer);
begin
  //When Finished page is shown, call the function
  //You can also call is when the "Finish" button clicked.
  if CurPageID <> wpWelcome then
    PinTaskBarCheck.hide
  else begin
    PinTaskBarCheck.show;
  end;
  if  CurPageID = wpFinished then 
  begin
  //if IsTaskSelected('pintaskbar') then  //if Selected the [task]
  //   zylPinAppToTaskbar(ExpandConstant('{app}'), 'MyProg.exe');
  if PinTaskBarCheck.Checked then
    zylPinAppToTaskbar(ExpandConstant('{app}'), 'MyProg.exe');
  end;
end;
procedure InitializeWizard;
begin
  PinTaskBarCheck := TNewCheckBox.Create(WizardForm);
   with PinTaskBarCheck do begin
    Parent  := WizardForm;
    Caption := 'Pin it onto taskbar';
    Top     := 200;
    Left    := 200;
    Width   := ScaleY(200);
    Height  := ScaleY(15);
    State   := cbChecked;
    //Hide;
  end;
end;
pintaskbar.zip