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I had a very similar problem on my new Vista Ultimate x64 machine. The system has 2 - Core 2 Duo 3.2GHz processors and 8GB or RAM and a NVIDIA Quad FX 1300 128MB memory graphics card. My problem turned out to be the graphics card; it did not have enough horse power to keep up with the processors and their power consumption. I had to pony up some more cash for an NVIDIA GeForce 8800 GTS 640MB memory graphics card. This card gets it's own power connection and completely solved all video problems I was having. Vista Ultimate x64 was really pushing the FX 1300 to it's limits as evidenced by watching the Task Manager. Yikes!!!
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