1. Unplug all USB devices. try again.
2. Revert to the stock ram. try again.
3. Boot SAFE MODE and see if it allows a system restore.
HOWEVER I can't find what model this is. There are a number of HP AMD systems that require a HP patch before some updates. Sorry but since I can't find which model I can't tell if this applies and if there is a cure.
Bob
I have an HP PC which is set for automatic updates. A few days ago it went into a loop during the update at the point "Configurating updates: stage 3 of 3 - 0% complete...". Although I can press f8 and make selections from the menu, it will show the drivers loading but then goes back into the loop. Any assistance provided is greatly appreciated.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic