If you have sommit like Win 98, you have to make a bootable floppy disk, can be made on any other machine, eithe ron WIn XP, right click on the floppy drive, format, create MS-DOS start up disk. or in WIn 98 go through the control panel in add remove programs, there a tab for creating this disk, cant remmeber where exactly. use eithe rof those to boot to, then like previously stated, when it loads type format c: then wait if its WIN XP, setup will format for you after a few stages, if you've lost that disk, well...stuffed, so gotta get a new one