Just found this series of messages, and I'm having more or less the same
problem.

4-5 daily crashes and lock-ups since I purchased this new computer (on
3.14), but I believe the problem is my NVIDIA graphics card. I have found the
beta driver update at their site, but, as has been mentioned here, I'm to
uninstall the old one first. However, I can't find it listed among my
"uninstall programs" list. Also, a search for "NVIDIA" lists nothing.

According to the packaging on my system, I should have a GeForce 6150SE
installed, but a deeper look in Vista states a GeForce 6100 nForce 430.

Odd? Any help would be greatly appreciated.