Windows 7, Vista, XP, and 2000 :
Users can use the option during
their installation to Format the drive, or you may delete the drive and
reset it up again. (See individual Guides from the
Windows NT :
The format is automatic from the NT installation.
Windows 98, ME and 95 :
Start computer up into MSDOS and type "FORMAT
C:\" and then start the windows reinstallation.
Or Restart the computer in MSDOS mode and type
"FORMAT C:\" and then start the windows