ok that sounds exactly right then. Give both your card and your CPU a slight overclock. I know that 6850s OC well they are a very popular card. Also, reduce the settings down just a little so your frames run 30+. Probably should run "recommended" settings. Splendid may be the mobo, don't really beat yourself up over it, as long as your card isn't running as crappy as it was before.
A physical memory dump here or there, a slight lag/freeze here and there...I'm changing SATA ports, a possible solution I read about. Then AMD drivers.
EDIT: I'm currently defragging. As far as the error goes, it goes back awhile, well over 2 weeks ago, but only now is it just spamming my Event Viewer. When the computer is finished defragging and everything, I'll launch up GW2.
I read somewhere that some guy had it for his graphics card/drivers. I'm going to roll back to AMD's just to double-check. Doesn't hurt.
EDIT: Installed AMD drivers just fine. Booted up game, worked great as we were talking about earlier in this thread. I rebooted the compy, and then went back into Guild Wars 2. Now it lags terribly again. I'm unsure as to what is causing this.