1. Delete ur cache
2. Delete WTF folder
3. mabey disbale ur addons
this is casued my an overload of your virtual memory, WoW uses alot of it, and if you do not have the right equipment this may happen, the WTF folder carries you prefernces and whatnot; ur Cache folder holds data from mobs, weapons, drops, items, names, and other things like that, deleteing this first may solve the problem right off the bat, you will notice no changes if you delete this; if you are on a free server, make sure you disable your addons, many servers do not have the same coding as retail servers, thus many addons do not work, and error.
Try and see if it works
Това го копирах от един форум,така че незнам дали ще проработи.Ако не разбираш английски кажи,и ще ти го преведа.