"MSS" wrote in message
news
I have XP Pro Version 5.1 running but I do not have the original XP disk.
I
tried to install the various upgrades via download as well as with a
service
pack 2 disc. I get an error message that I have an unregistered copy of
XP &
therefore can't do the upgrades. Can I purchase & install XP PRO as an
upgrade or do I have to buy the full program? Also, what if I want to
but
a lower version of Windows rather than XP Pro.

If you have Win98, or WinME that you bought in the past, just get the
upgrade XP version, then it'll ask you for the previous copy before it
installs.