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I just did the same and remember that I had to it twice for some reason. I'm guessing you've got this? http://www.nvidia.co.uk/object/Quadro_win7_winvista_64bit_191.66_whql_uk.html
hmm so you were able to get it to work? I just tried installing that driver again to no avail...
Just FYI I rolled back to driver version 186.30 and it solved the problem. Really weird that none of the new driver releases work correctly with AE.
It might be good to completely uninstall the graphics card, restart the computer and then allow Windows to reinstall the graphics card itself. Does this solve the issue?
Also, Microsoft does have an official Windows 7 Support Forum located here http://tinyurl.com/9fhdl5 . It is supported by product specialists as well as engineers and support teams. You may want to also check the threads available there for additional assistance and feedback.
Microsoft Windows Client Team