Yes, you can. That's how I install Windows XP. You'll need to boot into an OS (if none are installed on the hard drive, you'll probably have to boot off a Windows PE CD), then run something like: SET XPCD=Location of your XP install files SET INSTALL=Drive letter you want to install XP on to "%XPCD%:\i386\winnt32.exe" /syspart:%INSTALL%: /tempdrive:%INSTALL%: /unattend:%XPCD%:\i386\winnt.sif /s:%XPCD%:\i386