Ok, I'm at a loss with this one. I recently got myself a spiffy new MacBook Pro. 2.2ghz i7, 6750m, 4gb ram, all well and good. I have Bootcamped Windows 7 Ultimate, and everything is up to date and running smoothly. However, I can't for the life of me get Grand Theft Auto IV running at a respectable level, which is doing my head in. I can run everything else just fine and at max settings, such as Crysis 2, Batman, Just Cause 2, etc... But GTAIV runs like it's stuck in quicksand, which makes no sense. I've tried various drivers for the graphics card, made sure all but the bare essential processes have been killed off, tweaked command line settings for the game, re-installed it twice and tried every version, from out of the box to 18.104.22.168. nothing. Get this: I run it at the native resolution (1680x1050) and if I set it *lower* the performance gets *worse*. Does anyone have any ideas on how I could fix this? I was looking forward to christening it with GTAIV, but since I went from my old desktop which can barely run it above 15fps (Core 2 duo) to my first ever Quad Core laptop, It's bizarre that it runs *worse* on a machine that is much more powerful.