posh, do you have an Nvidia video card? I do and had a fucking hell of a time when i first got bioshock. Get the LATEST drivers for your card, first and foremost. you are also no doubt running vista, so you could try compatibility mode, though that probably wont help.
Try the new drivers and also try lowering the settings. Also, check to see if there are any bioshock updates available. out of the box, the game was pretty broken, but over the last almost 2 years they have ironed out the bugs. mine ran like sahit for 9 months, but has purred like a kitten ever since.
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