You might also want to remove it in Control Panel, disconnect it physically, then reboot. Then turn off power and reconnect the cables and it will be detected.
I had the same problem when building my PC - I had an old one which didn't work, removed it and installed the new one, and though WIN98 knew I had a floppy drive, it wouldn't work. By following the procedure above, all is well in Abit land.
Hope this helps.