Black screen after Windows 7 install on late 2009 iMac

Boot into MacOS, install either (NTFS ~~Mounter)~~Mounter or (NTFS ~~3G)~~3G. in order to make the NTFS partition writable.

On the Windows OS drive, delete the existing ATI driver:
~~bq.~~ /Windows/System32/Drivers/atikmdag.sys

Reboot into Windows 7, download the latest ATI HD ~~4750~~4850 driver from AMD.

Note: Apple’s alleged fix for this graphics card driver issue is a dud.