if your computer won't boot from a CD but will boot from a floppy, try smart bootmanager http://sourceforge.net/projects/btmgr/ create the floppy from the image file and boot from it, the floppy will allow you to boot from your CD drive.
Or, copy fdisk.exe from the CD to a bootable floppy.
Apart from killdisk/delpart etc., - as "Mech2go..." advises... - one could simply download an image of a '98SE bootdisk (bootdisk.com); expand it to a floppy. Then use that floppy to run the Fdisk util it will contain - to remove the partition...
That same bootdisk would also allow you to run delpart/killdisk etc. from the a:\> prompt...
Personally I'd be inclined to run delpart/killdisk or similar (rather than a simple Fdisk routine) so as to make the drive info reasonably difficult to regain/recover...; especially if donating the PC to "A.N.Other..." and at all concerned about your personal security/privacy...
Incidentally if you download the correct image it will also have CDROM drivers included; and thus would allow you to access the CDROM...
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