i use this code to install SYSTRAN Professional Premium v5.0 English-Arabic and i think its work for version 4.5 u need to change lang code /L0x0409 for English cmdow @ /HID ECHO. ECHO Please wait.. ECHO .............Installing ECHO .........................SYSTRAN Professional Premium 5.0 English-Arabic start /wait %cdrom%\WPI\Install\SYSTRAN\SYSTRAN.exe /L0x0409 /S /v/passive Exit