Undo your last Restore and then perform a Windows repair:
• Click Start; Run.
• In the Run box, type cmd.exe to open the command prompt window.
• At the prompt, type sfc.exe /scannow
• Press ENTER. If Windows finds problems with the system files, you will be prompted to insert your Windows XP installation CD to restore the files.
If no problems are found and the scan finishes, type exit and press ENTER.