Weird visual glitches with Windows games

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http://ubuntuforums.org – Hi, First, I'm rather new to Ubuntu (installed it like 3 days ago?). Anyway, I thought it would be nice to play some good old titles which, unfortunately, support nothing but Windows. The solution - Wine. Sure. I've installed COD MW1 and MW2 so far, and both run nice apart from a weird visual glitch - instead of smoke/fog effects, I get a weird... surface, flashing red/black/whatever. This happens just with smoke or mist effects, although I suspect it might affect the general game performance as it sometimes skips, which, considering the configuration of my computer, should not happen. But any (Hardware)