i have a sony external dvd writer. i tried watching a movie on it today and it skipped like crazy. the audo was fine and didnt skip. but the video would pause and the catch up every quarter of a second or so. i tried two movies that i made back ups of. and then i tried both originals as well. all 4 did the same thing. all my movies play perfect on my sond dvd player for my TV but wont work on here. is there something wrong with my computer, sony unit, or dont you know. and troubleshooting i can do? thanks