Reboot loop during "Preparing to configure Windows"

I have Windows 7 x64. Windows has recently installed some updates and when it rebooted it showed the "Preparing to configure Windows. Do not turn off your computer", but after about 10-20 seconds it automatically reboots.

I have tried booting with everything attached (keyboard, extHDD, mouse) and also with nothing attached. I have tried using a recovery disc to "repair" but it found no problems. I have also tried to boot into safe mode but it still tries to configure windows then reboots.


Suspicious updates:

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SOLUTION: (works in my case)

Copy files:

• DEFAULT
• SAM
• SECURITY
• SOFTWARE
• SYSTEM 

 from \windows\system32\config\RegBack
 to     \windows\system32\config


Resources:
http://www.sevenforums.com/tutorials/139576-startup-repair-infinite-loop-recovery.html
http://www.sevenforums.com/bsod-help-support/192279-reboot-loop-during-preparing-configure-windows-can-t-safe-mode.html