Have you completely uninstalled and reinstalled the nvidia driver? If you dont know how to do that ill give instructions below
Start > Right click Computer > Manage
Click the little arrow next to "Display drivers"
Right click (in your case) NVIDIA GeForce 8800GT(Microsoft Corporation WDDM V1.1) > Properties
Then click on the tab "Driver"
Then Click "Uninstall"
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Make sure you have a new driver ready for your card. also make sure the driver IS NOT a beta.
My Computer
At a glance
(all OS listed in x64) 7, 8, server 2003, 200...Intel Xeon E7-887064 Gig 32*2 DDR3 ECC 13332x GTX Titan
Once downloaded, just Right Click the Exe and click "Run as Administrator"
Follow the prompts, then once installed restart your machine. Let me know if this helps
My Computer
At a glance
(all OS listed in x64) 7, 8, server 2003, 200...Intel Xeon E7-887064 Gig 32*2 DDR3 ECC 13332x GTX Titan