Depends on your tv. If you have a digital set, choose the setting that produces the best picture. Upconversion can produce subtle picture improvement with some DVDs. But don't expect miracles because we are all limited by the medium until HD DVD's arrive. If you have a standard analog set, you're stuck with 480i.
its a panasonic 1080i hd compatable rear projection t.v. i was just wondering because on some movies i get black little boxes were the black is when watching the movies. was wondering if its set to high for dvds. or is ther another problem.