Once I get into a game after the commander has landed, the game crashes within a couple of minutes. Sometimes it is a system hang... sometimes it is a hard reboot.... one time it was a pa.exe has stopped repsonding message. My drivers are all up to date. Attached are my dxdiag results
There are a few crash reports in your DxDiag.txt and they seem to point at the graphics drivers. It's possible they got corrupted somehow. Could you try downloading the latest again from here: http://www.nvidia.com/download/driverResults.aspx/103913/en-us Then uninstall your current drivers, reboot, then install the newly downloaded drivers and reboot again.