Here is the way to do it by using this workaround:
Hope this works for your problem, if it does not, it will not harm your machine.
You will need your Windows® XP SP2 CD ( It will not work with the manufacturer's "Recovery Discs" in this instance ).
Insert the Windows® XP CD in your drive. (Hold down the Shift Key to prevent it from starting.)
Go Start > Run > type in sfc /scannow …please take note of the space between the sfc and the /.
This is the System File Checker (sfc)...it will scan all the Windows® core system files to ensure that they are in their respective correct places, and if not replace them from the CD.
During the scan you may be asked to Insert the CD, if this happens just go retry and let it do its thing.
One important point: While sfc is running, it is not advisable to do any other work, or have any browsers/programs running on the computer, until the scan is complete. (This process will generally take around 45-65 minutes to complete).
Once finished, remove the CD and reboot your machine.
If this does not work or you can't do it (no SP2 CD), check here for how to repair XP home: http://www.windowsxphome.windowsreinstall.com/installxpcdrepair/indexfullpage.htm
And here for how to repair XP Pro: http://www.windowsxpprofessional.windowsreinstall.com/installxpcdrepair/indexfullpage.htm
And don't worry, all these methods try to repair not remove (just go slowly and don't miss a single step and you will be fine)
So here we have it, I hope this will help guide you to a better working machine
Good luck
Cheers
QD 1956