Here's a good step-by-step guide:
http://www.windowsre...loppy/index.htmIf you don't have a 98 floppy disk, just download one from
http://www.bootdisk.comOr here's a quick guide:
1.) Get your hands on a Windows 98 start disk (a floppy).
2.) Pop the Windows 98 Startup Disk into your computer and restart.
The computer will reboot and load off the floppy - it should prompt
you if you want to enable CD support - choose that option.
3.) Once you get to the command line, type:
fdisk. Delete your primary partition. Next create a new primary partition. (This will totally scrub your hard drive.) It will ask if you want to use the FAT32 support - say
yes.
4.) In the fdisk menu first choose (1) Create DOS Partition or Logical
DOS Drive; then chose (1) Create Primary DOS Partition. It will then
ask you if you want to make it the largest size - say
yes.
5.) You are done with fdisk after this. Back all the way out back to
the command line and ytpe:
format c:This will format your hard drive, destroying all data.
6.) When you've finished formatting, you're ready to reinstall Windows
98. Your harddrive is 100% clean now, I promise!

Reboot your
computer, loading off the Windows 98 Floppy again. Opt for CD-ROM
support (again). When you get to the command line, navigate to the CD
ROM drive (probably E:) by typing:
E: (replace e: with whatever, if your CDROM is a different drive letter).
7.) Type:
setupYou should be off and running on a fresh new install of Windows 98!
Congratulations!