w2k fails to see fixed disk

I am trying to install w2k from an upgrade disk.
After loading the initial files and getting the starting w2k screen, i get two results.
1.there are no fixed disks, or
2. stop error.
this machine previously had win 98 and have tried installing w2k as an upgrade from win 98 and also as a clen install with the same results.
Can anyone shed some light on this problem?
At wits end…….thanks