Windows 8 -- Blank desktop after installing NVIDIA drivers
Use F8 to get the Option menu, choose "Troubleshoot"
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Then choose "Advanced Options"
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Then choose System Restore
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Have you tried booting in the Safe Mode by pressing F8 during the boot sequence? In safe mode you may be able to uninstall Nvidia display drivers
You'll want to uninstall any graphics drivers and use the Windows Update Nvidia drivers. There are substantial changes to the Windows 8 graphics driver model that you don't want to install OEM drivers.
For more info, google the Windows 8 WDM.