Computer freezes up when running SW

Hi all,

I have recently upgraded at work two computers with the following configuration: Intel i7-3960x CPU @3.30GHz; 16GB RAM;Nvidia Quadro 4000; Windows 7 64-bit.

When we run SW, after a certain time, computers freeze up (independently one of another) and we can not even Ctrl+Alt+Del because nothing is responding( mouse or keyboard). The only way to get out of this is "Reset" button. We've been having this problem for a week now. Initially I was running SW 2011, but the problem persists even after I upgraded to SW 2012 and installed the newest drivers for the video-card.

Any idea what it can be?

SolidworksGeneral