It took me forever to find this, but it turns out there is a bug with this particular Intel chipset and the Windows 7 drivers when you have VT for Direct I/O enabled in the BIOS. I must have turned this on at some point. Disabling it in the BIOS fixed the issue.
Thanks to http://blog.stealthpuppy.com/hardware/display-corruption-with-mobile-intel-gm45-chipset/ for the tip!
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