rename c:\windows\system32\grouppolicyusers and c:\windows\system32\grouppolicy from winpe .
Reboot and hopefully gp should be defaulted.
If its win 7 create a mmc just for non admins.
Pffft for far worse my techie asked me yesterday morning if I'd heard any news about Muhammad Ali. Being before 8am and barely awake I just replied with "What class is he in again?"
I'm now the butt of all the jokes in school!