Just installed the 169.44 Drivers, the latest official nVidia ones, and they appear to have worked! Now I'm actually noticing other bugs that I didn't notice before because it crashed too often!
I feel ya, bro, me too. You DO know there's a new SB update, don't ya, just released in the past week or two? It's XFi web update version 5. Also, the beta for nVidia's driver version 174 for the series 8's was released today. Is your nVidia card an 8 or 9?
But i did those things and I'm getting the same thing you are. But it got a LOT better after I installed those 2 drivers. Go on the nvidia website and do a driver search, and enable the "beta" option, and you'll see version 174 appear in the results. It's a beta but I've been using nothing but betas on all my systems for the past 18 months or so and I've found them to be just as good as a regular release.
If ya can't find it, let me know and I'll post you a link.
Peace.
GG