I've been trying to play an AVI movie but with no luck, though tried a lot of ways... First I played it in WMP 10 and it said some codec was missing, so it was showing the picture perfectly but with no sound. I installed K-Lite Codec Pack and tried playing it with WMP Classic as directed but it said there was an error and showed horizontal lines on the screen instead of the picture. WMP 10 could not play it either. After I uninstalled K-Lite Codec Pack, WMP 10 would not even show the picture! I decided to try Real Player 10 and it does show the picture, but no sound again. I have never dealt seriously with movies before, so I would appreciate any advice you could give me about this.