Try reinstalling SP3.
Does that mean reinstall Windows (with SP3) or just download the SP3 installer and run that?
The version of Windows I have is Windows XP Pro with
SP3. It installs Windows with SP3 included. So I never really installed SP3 because Windows came
If that doesn't work, try reinstalling the version of Windows you have, and then immediately go to the Windows Update site and do ALL your updating (including SP3) from there.
Apparently Windows Update doesn't work without SP3 anymore, so if I did have a version of Windows without SP3 then I couldn't even do what you suggested anyway.