Had the same problem a lot when I put my new 8800gt in my PC, most of the time its the fecking Graphics card drivers you on vista m8?
You might want to try getting a driver from http://www.omegadrivers.net/ and see how it goes.
Good luck
You might want to try getting a driver from http://www.omegadrivers.net/ and see how it goes.
Good luck