What file system were you using? FAT32 or NTFS.
If you were using NTFS, you need to wipe the NTFS partition off, Also you might need to make a new set of Floppy Disks.
I have a web site where you can download Windows 2000 Floppy disks (Although that is the only section available, as I am undergoing a upgrade)
http://www.bakpc.com/boot_disks.htm
Try that, Download the Boot Disks and make floppies (Instructions Included on the site), then try to reload windows and let me know if it helps.
Feel Free to email me at:
Trunks@dragonballzrealm.net if you need more help.
Good Luck
Michael