Step 1: start deleting all that junk crap on your computer ( that ram gets eaten up, espesialy if your running vista.)

Step2: Virus scan

Step3 (optional): If your runing Vista, there are some issues with reduced framrate in certain videogames. Im not sure if WoW is one of them ( it wasnt listed) but Im sure these hotfixes wouldnt do you any harm.

Here is the link for the patches on nvidia.com

http://www.nvidia.com/object/windows..._hotfixes.html

step4: Worse case scenraio, format. It fixes almost any software problem



Hope this helps!