Bugcheck Code: 0x9F (0x3) And "Won't Shutdown Properly"?

I have been experiencing shutdown issues for the past 4-5 days now. I click the shutdown option under the start menu, and the screen goes black and the power button is still illuminated. The light had usually gone off, indicating the computer is powered off, but now it's non responsive and I have to hold the power button down to shutdown. Upon further research, I saw a bugcheck on the 20th of Sept 2012, about 4-5 days ago. Has to be related. Furthermore, when the computer goes into hibernate, it becomes non responsive as well, just like the shutdown issue. Of course here is the requested info per the sticky.