I have a little problem with my WPI instation, and i dont know for what reason some computers failing when execute the aplications. With same configuration and diferent CDROM drivers, i get problem with 2 of 10 computers :S This is my launch of wpi: @ECHO OFF REM Example, how to look for CDROM-drive. Must have WPI.ICO at the root of the CD. for %%i in (C D E F G H I J K L M N O P Q R S T U V W X Y Z) do if exist %%i:\WPI.ICO set CDROM=%%i: echo Found CD-Rom as drive %CDROM% REM Determine the WPI startup path. REM if wpi should run off the cd the replace %~dp0 with %cdrom%. set wpipath=%cdrom%\WPI rem Hide this command window. %wpipath%\Tools\cmdow.exe @ /hid REM Force resolution to needed size for wpi interface. start %wpipath%\Tools\VideoChanger.exe 1024x768x32@75 REM Font installation - the smooth and customizable way. REM start /wait %wpipath%\Tools\fonts\fontinstaller.exe REM Special registry tweak needed. regedit /s "%wpipath%\common\wpi.reg REM Make WPI directory the current directory. for /f "delims=: tokens=1" %%i in ("%wpipath%") do %%i: cd "%wpipath%" REM Start WPI and wait for its end start /wait %windir%\system32\mshta.exe "%CD%\wpi.hta" REM Cleaning up the desktop. REM del /s/q "%userprofile%\desktop\*.lnk" REM Rebooting the sytem to finalize the installation process. REM shutdown.exe -r -f -t 30 -c "To finish installations WPI will now reboot in 30 sec..." exit :end Thanks for help and sorry for my mountain english