As I'm sure many are aware, the issue of "The beta version has stopped working" is all over the place.
MANY people using win 7 64 bit are having the issue, as well as ATI users. I have an Intel and could not run the game no matter what I did.
I just replaced it with an ATI Radeon HD 5750. Game works beautifully, it's on near high settings (turned off Occlusions and other check boxes)
Using a Core2 Quad core and the game runs perfectly with slight hiccups when really busy in town.
Problem really is the graphics card, we have to accept that ;;