I had to reimage...
Three things that killed it for me:
a) the Windows key just... didn't... work. Nothing. Nada. Zip. WTF?
key would start RANDOM applications. Random. Like one time it started Windows Media Center. Then it was Chrome. Then note-freakin-pad.
And the best for last:
Everytime I would start up a Linux virtual guest through the "Virtual Machines" application (OpenSolaris, Ubuntu, Suse, Centos), my host (Windows 7) would either: blue screen or freeze all other applications.
I think this is starting over however I'm not counting the days any longer. If I fall into any of the issues above again, back to Linux I go...