try re-downloading your graphic card.. I once had a problem where videos played frame by frame, and it was due to a needed update. But another time where this happened. the whole graphics card was broken.. If you personally installed this computer, are you sure you didnt bang it up against something.. or not clear the electric shock in your hands?

Also check to make sure that you do not have a virus, because sometimes thesy cause any type of program to freeze..

Other than that i really dont see why ur good computer should do this.