Help! Mafia 2 demo craches !!!

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I get crashes on Mafia 2 when i explode multiple cars. Why? Only when i explode with my tommy gun multiple cars. ex: 3-4 cars in a row. My spesc are intel i5, gtx 275 6gb ram. anyone has this problem?

My drivers are up to date, including physx. I run the game with physx on medium.

Anyone has this problem when exploding cars?

[Saberq]

Turn off Physx and try again...

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Ok...........

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I have turned off physx, and when i shoow and explode a couple of cars, i get a crash to the desktop.

I think is not my system, i have 46 fps with physx high and all at high.

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Installed windows, and the video driver, and i still have crashes when i explode cars.Anyone has this problem?