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On my MacBook5,2 (Nvidia 9400m video card) if the drivers are installed in Windows, Windows does not boot. Windows is installed in EFI mode, if that matters.

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What driver version exactly? Did it work before? What precisely happens during boot? (Errors?) – slhck Nov 9 '13 at 9:50
    
Version 9.18.13.2702 from 30 August 2013, the most current version offered by WU. – kinokijuf Nov 9 '13 at 13:34
up vote 1 down vote accepted

I entered the following into the startup.nsh file of the EFI Shell:

mm 0010003E 1 ;PCI :8
mm 02000004 1 ;PCI :7
fs0:\EFI\Microsoft\Boot\bootmgfw.efi

Now if there only was a way to set those registers in an EFI variable…

Technical info: While Windows 8 no longer expects an EFI system to have VGA-compatible video, Nvidia drivers apparently still do and crash if they don’t detect it. The above commands are supposed to enable the VGA support in the graphics card.

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