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your stuff overheating?

uhh virus?

Virus protection blocking the game?

Reinstall the game?

Just some things you can try.

You install new drivers, updates, programs?

That sucks dude, I have played about 40 hours of civ5 and not one crash

Ati cards have a Control Panel right? If yes play around in the settings there for Civ 5

Civ 5 crash with me only when playing large map + and am using core 2 duo ATI 5770 hd 3 gig ram, even on Dx9 or lower setting.