I burn DVD+R and DVD+RW on a phillips 685 set top box. It has InterVideo as an imbeded player. What I burn on the Phillips plays back fine on Phillips. When I go to my computers DVD player the story changes. I have installed on 2 different computers, REAL Player 10, Windows Media Player9, QuickTime, PowerDVD, and CyberlinkPowerDVD. The PowerDVD seems to be the most consistant player to work, with Windows9, chimming in occasionally, but not consistantly. I get "format not supported" They will play on my Home DVD player, but are real inconsistant with all these other players. Can it be my DVD drive? what can this be?