Lol...
Looking at your graphics card, that's your problem.
I had one of those before, couldn't really play anything!
It's definately not down to your PSU, because, if the problem was your PSU, you'd get even worse problems, believe me.
So I suggest; get a new graphics card, OR, either change the settings in World of Worldcraft for graphics quality to lower settings etc, and lower resolutions. You may need to do that for other games.