I tried to play a Genuine DVD (No illegal copies, real DVD I bought or rent) on my PC and it plays with no sound. I tried playing it on Windows media player, Quicktime, Real player, PowerDVD and a few other dvd players but all of them plays the movie with no sound. The only media player that played the movie with sound was VLC. I tried to play it on my laptop and it plays perfectly with all the other media players I named above. Any ideas why there is no sound on all the other players? I have downloaded all the known codecs (as far as I know) Thank you very much!