So i bought fallout 3 back when i had a 8800gt SLI q6600 setup it ran fine on that now I've recently got my new setup and it wont start a new game it crashes when its loading I've tried what running it in compatibility mode and disabling desktop composition I've read a few other topics but they're problems seem to stem from their Intel HD GPU's

Here are my spec's

windows 7 64bit home premium
I7 950 @4.2ghz OC'd
6gb triple channel ram DDR3
Asus Rampage II extream
Nvidia geoforce 480gtx x2 running SLI

Any help would be appreciated.