Hi, I have a Dell XPS 8500, OEM Windows 7 64-bit installed, nvidia geforce GT640. I did a Windows update last week but I stop halfway due to thunderstorm, I did a system restore and then continue Windows update the next day. now my PC restart automatically after a few hours, so I did another system restore but this time the system restore was not successful, and now my PC is stuck in endless restarting cycle. Can someone assist me? thank you in advance!