After I type in my Username and Password, and then click on Patch, I keep getting this error message:

D3D Device Creation Failed: -2005530516

Any help would be much appreciated.

Cheers,
Ney

EDIT:
I just did a Google search for "D3D Device Creation Failed" and found a lot of posts about this in regards to other games, but one thing I noticed that kept popping up in people's replies was that switching the AA can cause this error. Just prior to getting this error myself, I had gone into options and changed AA to 4x (also changed my screen resolution setting as well). I logged out, then tried to log back in and suddenly got this error. If the AA is what's causing it, how do I fix it since I can't get back in to the game options?