Try this it may help.
Shut down your PC and restart in DOS mode (click Start, click Shut Down, select the Restart In MS-DOS Mode radio button, and click OK). At the DOS command line, type
scanreg/restore and choose a backup copy to restore. Do not attempt to do this by launching a DOS window from within Windows; Windows uses the Registry files when it is running, and you won't be able to replace them while they are in use.
If that fails this may work
http://support.microsoft.com/kb/220878/en-us
Allen