Hi again Dennis,
I just re-read your message, and saw the last sentence about re-installing XP.
There is no need to re-install, that would wipe out all your data in the 'C' partition, but a repair install is easy to do, especially if you are on broadband. That keeps all your data, and just repairs the XP installation, but would mean that you have to re-download all the XP updates again.
If this proves to be necessary:
Boot from the XP install disc.
Your hardware will be investigated.
1st screen - Windows loads files.
2nd screen - Welcome to Setup
Press 'Enter' to setup XP (NOT 'R' to repair)
3rd screen - Licence conditions - press F8.
4th screen - Select 'R' to repair the installed XP.
It will appear that XP is being re-installed and there may be several black screens, but don't worry!
Setup will boot up after the repair, ignore the 'Press any key to boot from CD' message, and a clean, repaired XP will boot.
All your settings and programmes will be as before, only better! Now to install SP2 if necessary and download all the updates.
I hope that one of these helps a bit.