Hello. I upgraded to Win 10 on Friday, and since, despite several resetting PC attempts, Win 10 will not load to the login screen. Instead, it is stuck on a loop flashing between the lock screen and a gray loading screen quickly back to the lock screen -- instead of loading to the login screen. This only happens when I attempt to restart or update my PC. If I go to the lock screen because I locked my PC or it fell asleep, I can unlock it. I have also attempted to reset my PC to the previous build, to no avail. I am running out of ideas! I have no restore points. Please help!