Computer flashes Blackscreen, Bluescreen, Pixelation, artifacts

I just upgraded from windows vista with a complete reformat of my computer, I'm now running on windows 7 Enterprise. I first suspected that it was a graphics card issue with my old 9800 GTX+, but upon receiving a brand new graphics card the problems kept occuring at first only during gaming, but it continued to digress, leading to complete pixelation of my screen, black screens on startup, freezing, etc this all happening during windows vista. I tried multiple drivers of nvidia drivers for my 9800 but nothing worked and it only got worse. I reformatted vista, and still it didn't work so I was face with either getting a new different gfx card or upgrading my system to windows 7 thinking that it may be a drivers problem but the problem still continues. The pixelation got horrible leading to blue screens, reinstalling the driver was a quick fix enabling me to use my computer for about 10 minutes before starting all over again. Disabling the graphics card was the only fix that I found, but this just limited me to internet surfing and I could not game or use my gfx card at all. Now that I have reformatted to windows 7 these problems were very minute in the beginning, artifacts while watching the Starcraft 2 tournaments, and black pixels that popped up randomly during gameplay in Starcraft 2. It wasn't that bad at first, but again it has started to digress. Now I am blue screening on startup, and disabling the driver is the only fix. My GPU is running at 62 degrees Celsius. I don't know what the problem is, Please Help!!

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