Windows Update is notorious for busting up hardware via their nifty hardware update section. I recently DLed a hardware update for a GeForce 4 card and it blue screened the hell out of my machine. The second I got the driver from the vendor, all was well.

Take a look at what updates were applied to one of the hosts. Check and see if any are related to hardware updates (of course I'm talking about the MS driver updates for your hardware) and roll it back on one and see if the issue goes away.

--TH13