I've been trying to play Mirror's Edge for some time now, but every time I start a new game, it locks up like 10 seconds into the introduction. I'm using a Radeon HD 4670, and I have a suspicion that there's a conflict between my card and Physx. Admittedly, I don't know the first thing about Physx, except to say that it's an Nvidia system, which makes me think the two don't want to play nice. I'm not sure if I should disable Physx for the game, if that's even possible, or if I should try a different approach. Either way, my PC locks up and I have to manually shut it down each time.