seeing that the text and the bars on the game isnt blurred is a bit strange, might be that a bsod has dmged some files in WoW. could maby be a virus? try a virus scan.. also that you say you had several BSODs is a serious problem, normally you're only supposed to get like 1 or so.. anywho.
If you're able to try the graphics card on another computer or the a different card on yours. no more ideas..also get the name of the BSOD and theres usually the reason of the problems