Thanks cro-man, heres a question, will that work if installed on a multi-processor machine, or do i need to edit the ntkrnlmp as well, and use FOR /F "tokens=3 delims= " %%A IN (\'REG QUERY "HKLM\SYSTEM\ControlSet001\Control\Session Manager\Environment" /v NUMBER_OF_PROCESSORS\') DO SET NUMBER_OF_PROCESSORS=%%A bootcfg /copy /D "Windows XP Professional" /ID 1 if %NUMBER_OF_PROCESSORS%==2 goto DUAL REM ----For Single proc bootcfg /RAW "/Kernel=singkrnl.exe" /A /ID 2 goto End :DUAL REM ----For Multiprocess/Hyperthread proc bootcfg /RAW "/Kernel=dualkrnl.exe" /A /ID 2 :End bootcfg /Timeout 2 bootcfg /Default /ID 2 as a bootcmd?