Just a bit odd... I have been experiencing even more frequent with latest versions, some similar hard lock ups, but only when exiting the game!...Very annoying, btw, cause the only solution is also an hard system reset...
The screen goes into a bunch of mixed black, white and yellow lines, but only the system video really seems to halt, since I get hdd activity when I press keyboard shortcuts like the "window"+e keys, or fool around with the mouse...
Could this also be an Nvidia issue? I have a GeForce 6100 on-board with ForceWare 93.71...