Updates on 11/16/12 are making my grafx card shut down after 15 min of sitting

My computer auto installed updates on 11/16/12. And then the problem started. If I dont click a mouse button and let the computer sit for more than 20 minutes (like when watching video) the grafx card shuts down. If I click the mouse it comes back on. I

check that the screen saver was off and power setting set to never and downloaded latest driver for the grafx card. But the problem would not go away. I restored to a restore point just before the updates on 11/16/12 and the problem is gone. But now windows

will not let me shut down without installing the updates. I dont know what to do now?

System is : asus core2 quad with 8gig ram running win7 and gforce gt 220 -1gig grafx card.

View this thread