We need more detail of your symptoms before we have a hope of pointing you in the proper direction!
Having said that, plesae repost your query in a more appropriate forum (with lots more detail) - Microsoft Community Windows XP System Repair would be a good place to start....
http://answers.microsoft.com/en-us/windows/forum/windows_xp-system
Noel Paton | Nil Carborundum Illegitemi |
CrashFixPC | The Three-toed Sloth