Remove every kexts you've installed for the grapics card, for me it's working perfectly.
EDIT: Install this updated driver if you don't even update the graphics driver (that is for 10.6.4):Click
Okay. I had nvdan50hal.kext in there, geforce.kext(which I left alone), geforce 7&8, and the nvinject. I deleted all of them. I checked my about this mac under graphics and have the same screen as above. Except. Now I only have 1024 not 1366. And the link you gave me for the nvidia driver said it was not compatible with my OSX. Any ideas whats wrong?