Simple Solution - Stop playing a crappy game. Long Solution - Uninstall then Reinstall and keep playing a crappy game.
wow is not a crappy game its just imba and whenever they try to fix it they just shift the power to somewhere else. i suggest deleteing your cache and wtf folders, then running a repair. if this doesnt work reinstall, and if that doesnt work contact blizz.
Delete your cache folder. Describe what you were doing to get a crash. DO NOT DELETE WTF UNLESS YOU BACK IT UP! WTF Is your configuration. Addons/Macros/ETC.