This is a longshot, but if these two DVDs are non-anamorphic, or not "enhanced for widescreen TVs", then you'll get the bars on all sides, and the only thing you can do is to use the zoom function on your DVD player or your TV to get rid of them. Check the back of the DVD jacket where it says widescreen. Does it also say "enhanced for widescreen TVs" or "anamorphic"? If not, then it's the DVD. If not, then there's a setting somewhere in your system that's wrong.
cheers,
supervij