You could use UnregisterDLLs to call it or RunPreSetupCommands, either way this is how that would go (might only work with advpack.dll,LaunchINFSection) [UnregDLLsection] 16422,Utility\T-Clock2010\Win32,clock.exe,,,"/exit" ; Or [RunPreSetupSection] """%16422%\Utility\T-Clock2010\Win32\clock.exe"" /exit"