Oddest problem I have ever experienced.
First let me say that I was able to play the demo fine and yes I've updated my video drivers several times since I encountered this problem. I have been able to run much more demanding games just fine both before and after so it is not a capabilities issue.
So what's my problem. Shortly after I have finished setting up a game and the world has loaded my computer will turn off. Not lock up. Not get choppy and crash. One second I'm running around collecting the starter quests the next it's off as though I'd pressed the power button. This has not happened with anything else and I am completely mystified. Please help. Preemptive thank you-s all around.