-Ever-

The first thing that comes to mind is some kind of driver problem. Those games tend to update/change drivers to gfx cards and whatnot. I'd consider starting up in safe-mode and uninstalling the game and seeing if that fixes anything. If it works, update all your drivers and try reinstalling. Maybe chose custom install and only let it install the game and things that are absolutely necessary to run and upgrade DirectX etc. on your own time...

These are just guesses as I'm not computer expert, but it's what I'd do so I guess it's a start..

Best of luck. WoW is a fun game btw

-T

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Embracing the goddess energy within yourselves will bring all of you to a new understanding and valuing of life. A vision that inspires you to live and love on planet Earth. Like a priceless jewel buried in dark layers of soil and stone, Earth radiates her brilliant beauty into the caverns of space and time. Perhaps you are aware of those who watch over your home And experience of this place to visit and play with reality. You are becoming aware of yourself as a gamemaster...
--Acknowledge your weaknesses--