I have had no crashes at all. Game is stable and plays far faster now.
TBB51>>> Validate all your files if you have not already done so. Re install your vid card driver (DL the latest) if you have not tried this.
If you are crashing still I would no trouble shoot your hardware. The first thing I think is it could be a faulty memory. DL and run Memtest. Its free and it will find any issues you may have on your memory. This is my first choice.
Next is pull out your vid card and if possible borrow a friends and put it in and see if it runs. You may have issues with your vid card. This is the easiest way to diagnose that. Just swap it with another one and see if you get stability.
last is the hardest to find which could be a fault in your mother board. This is usually not the case but could happen.
I wish I had easier answers for you. The memory problem happened to me (same crashing symptom) and I had very good ram from Corsair. As soon as I ran mem test (its about a 12 hour test), it found the bad sectors and ran it again, Corsair replaced my memory for free.