Recently, while playing Spore (with new patch), my screen froze up and all I could see was a bunch of multicolored lines going from the bottom left to the the upper right of my screen. I thought it had to do with the patch but yesterday I was playing counter-strike and the same thing happened. I'm not sure if it's a card issue but my computer also freezes up completely when this happens and I have to turn it off manually. Any idea, guys? I'm playing with 6800GT and the rest of my computer is pretty much up to date on everything.