Are you saying you are in 98 or XP at the moment?
If 98 you'll need to setup the DOS drivers (though I think if you boot from the XP upgrade disk it will detect a suitable OS on the hard drive and let you install anyhow.... but it's been an age since I've done that upgrade)
http://artsweb.bham.a...ical/doscddrivers.htm
If you are in XP and the drive isn't showing in device manager in XP but does show in the BIOS then you need to remove the upper and lower filter entry from the registry so look in HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\C
ontrol\Class\{4D36E965-E325-11CE-BFC1-08002BE
10318}
and delete the upperfilter and lower filter keys if they are there.