Getting black screen when playing World of Warcraft

I got a new computer and it works perfectly fine on all games except World of Warcraft. Whenever I played WoW the screen randomly turns to a black screen. It's hard to play whenever you don't see what you are playing.
I am using NVIDIA GeForce GTX 570 275.33 and it's driver is updated. I'm keeping this graphic card on a good temp so I don't see any problem with that. It's very frustrating especially if you are on the verge of playing.
This is already my 2nd graphics card because I returned the old one thinking that it is the problem. Any solutions you might have are greatly appreciated.
