If you're running the retail game as it comes on the CD, there's a screen resolution patch that allows you to use resolutions higher than 800x600....
Hmmm... could you check what version it is that you got? Original retail version is 1.0.116.0, demo/non-English/patched version is 1.0.117.0, and...
There's an AMD-optimized excutable on the disc, at least on the retail version there is, try using it instead. I think it's called TrespassK6.exe...
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