Media Player scaling video

I have ripped my Pulp Fiction DVD to an .iso.  When I open the file in Media Player, the menus work fine, and the movie plays fine, but the movie plays in a “window.”  I think the movie is playing in a 720x480 “window” instead of scaling to full-screen on my TV.  The “window” has black bars on both the top and side, which means it is not scaling…

How do I get my movies to scale?  I understand a letterboxed movie won’t play full-screen, but I should at least get full-width?