Home audio & video: sanyo DRW-500 recorder

sanyo DRW-500 recorder

i have a brand new sanyo DRW-500 dvd recorder. i recorded a movie which plays back perfect on all dvd players connected to various TVs (of varying sizes) in the house. However when i play the dvd on either computer in the house the picture is not as sharp and comes with annoying black bar on the right side. i recorded clips using all the settings on the dvdr in hopes that it was just a stupid settings issue but they all had the same result. anybody have any ideas on what is wrong???