Luminous Orfan

I have been trying to play SL on an Alienware computer running Win 7 64bit and a GeForce 545 graphic card with updated drivers v. 344.75. Upon connecting it does fine for a few seconds then "noise" is shown across the screen and the graphic card crashes and recovers. Any ideas? Ive done a clean install of drivers with no luck and no other issues anywhere else with graphics. Any ideas, suggestions or help is greatly appreciated! Luminous Orfan