I have a 8800 GTS 512 with a G92. I run Vista Ultimate 64 bit on a Q9300 with 8 gigs of ram. I always run the game in dx10/11 mode.
I think the game has crashed on me maybe once but no more than two times. I've been playing single player and multiplayer and I think the crash or two I had was in multiplayer. I've played several multi-hundred turn games. I have seen an occasional messed up graphic with horizontal lines through it and the speed at which the graphics are drawn seems slow for this hardware.
Anyway, my point is that I have similar hardware and I've really not had crashing problems much at all. I know this is not very useful to those who are having problems.
If it will help, I will go and try to dig up my video driver version. I've not upgraded them in many months, definitely not since I've installed Civ5.