Try this.
Do you have an XP CD?
If so, place it in your CD ROM drive and follow the instructions below:
- Click on Start > Run and type sfc /scannow then press Enter (note the space between scf and /scannow)
- Let this run undisturbed until the window with the blue progress bar goes away
SFC - Which stands for
System
File
Checker, retrieves the correct version of the file from %Systemroot%\System32\Dllcache or the Windows installation source files, and then replaces the incorrect file.