I would like to offer my two cents on this issue. This exact problem of all my drivers and programs crashing, and even Blue Screens of Death, plagued me for months. The game ran fine in low-intensity situations, but as soon as I tried to do an instance, I would have a catastrophic system failure. And I'm about to tell you…
Actually that might be it, I did just transition from Gold to Silver. I've bought a ton of costume slots, it's just that one in particular. Thanks for the tip, that makes sense.