I've recently bought a brand new computer (Ivy Bridge CPU, high amount of RAM etc.) and I bought a Gigabyte GTX670.
The problem is that whenever I have the nVidia drivers installed, every 5-10 minutes my monitor will go blank and then on again. A little yellow sign with a black exclamation mark will appear in my Windows task bar. If I select it, it disappears.
When I am running a game (such as Diablo 3 or Skyrim) and this happens, the screen will go blank, come back, and then the game will be running very slowly at 30fps. It can only be fixed if I alt-tab out of game and come back in.
I tested this with a few variables. It is 100% a driver problem because when I go back to normal integrated graphics drivers, this does not happen. I also re-installed the nVidia drivers selecting only 'Graphics Driver' in the Custom Install and not including the other add-ons but this made no difference.