|... if you have the xp cd try repair install|
... info... more here and here
How to Repair XP.
1.Boot the computer from your Windows XP CD.
2.When you see the "Welcome To Setup" screen press [Enter] to start the Windows Setup.
Note: Do not choose "To repair a Windows XP installation using the Recovery Console, press R", you Do Not want to load Recovery Console.
3.Accept the Licence Agreement and Windows will search for existing Windows installations.
4.Select the XP installation you want to repair from the list and press [R] to start the repair. Setup will copy the necessary files to the hard drive and reboot.
5.Do not press any key to boot from CD when the message appears. Setup will then continue as if it were doing a clean install, but your applications and settings will remain intact.
... its worth a try!
... Posting is provided "AS IS" with no warranties