Eccolo, da Tomshardware:
"I had the same issue last night, I just got off work and sat down to play some games and noticed geforce experience crying about an update so I figured why not just get it over with and installed the update. It restarted and then I couldn't boot my pc, most times it was getting right to the login screen then I would get a blue screen saying "DPC_WATCHDOG_VIOLATION" over and over sometimes I would be able to log in and then try to start a game but soon as fullscreen kicked in I would get the blue screen. To fix I just booted into safe mode and uninstalled the new geforce driver then installed the old version and everything is working like normal since. I played games for about 4 hours since then with no issue so just give a rollback a try and you should be good."
Bene nvidia, bene