Okay then, go to HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System and set all values to 0. Then quickly right click the system folder, go to permissions and remove all the permissions. (Admin, SYSTEM and everything else), then apply and your done. It may ask you if you are sure about this, just click OK.
After you've done this reboot the PC and set the value i told you eariler to set to 0 and reboot again.