You may need to follow Smalln's guide:
http://www.tonymacx86.com/mountain-lion-desktop-guides/95585-guide-ga-z77x-ud5h-i7-3770-nvidia-gtx680-mountain-lion.html
But before you do so, I recommend that you re-format your hard drive to erase all hidden files, so that you can have a fresh start...
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