How do you reformat Windows 98 SE?

If you mean reformatting the hard drive, then go to start>shutdown>restart in DOS mode>okay. Your computer will reboot and stop just short of loading Windows. Type in "format c:" (without the quotes)and press enter. I think this will work;if it doesn't, try "fdisk" and remove the DOS partition. NOTE: Before doing either one, make sure you copy anything you want to keep onto a floppy disk or CD since this will erase all data on your hard drive. If you want to reinstall Windows put the install disk in and reboot the computer.