I'm not sure this will be of any use but the same thing used to happen to me last year with my nVidia 7000 series card (cant remember the exact one now!) I used to get black squares and kinda like black spikes appearing across the screen. When I'd go to the control room there wouldn't be any background just the figures against a black screen. It got progressively worse until I couldn't even access the game properly. I left the game thinking it was a problem there until it started affecting other games. Turns out it was a corrupted video card although it passed every diagnostic I ran on it. Changed to a 8600 GT and had no problems ever since
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