It's because of your GeForce GTX 670, with that one and the GTX 680 there is a very old bug, almost 6 month now, you will crash in towns and during cutscene, you need to disable Depth of Field to solve the problem, and also to disable that effect in cutscenes :/

It sucks a lot, on those high end GPU, being forced to disable feature, SE really needs to correct this bug, more and more people bought those new GPU now, and we don't want to wait 2.0 for a fix...