Anybody else having this problem? Its really annoying and starting to get on my nerves.

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I recently bought a new comp, fairly good spec (Alienware Area-51 M15x)
and like all new comps, it comes with vista! apart from the shader effects and other gfx issues
i experience this annoying 'freeze' bug. it happens randomly in IL, its not Inet lag, its almost processor lag.
but i know my comp is more than good enough to run the game, so im not sure whether it's a compatibility prob with vista.
all of you experiencing the same prob...do you have vista?
Carloss