Also crashes sporadically here, both on windowed and fullscreen -- unfortunate to know I'm not the only one! Here are my specs, for starters:
Core 2 Duo T7250 @ 2GHz, running Win7 Pro 64-bit, DirectX 11, 4GB RAM
NVidia GeForce 8600M GT, driver ver. 126.96.36.19962 (10/15/11)
When you mention dxdiag info, what are you specifically looking for? It returns no problems on all tests, and the above information is pretty much all it gives...