Those black bars are supposed to be there. These movies was filmed at a wider aspect ratio (2.20:1 or even wider 2:35:1) than your TV (1.78:1). So if you want to see everything the director filmed, if you want to see how he intended this movie to be seen, you would have unused space on your TV in the form of black bars at the top and bottom.
If you don't care about losing part of the picture, then you could just hit the zoom button on your BD player or your TV, and pick a zoom setting that enlarges the picture but doesn't distort it.
cheers,
supervij