everytime i try to play a quicktime file it never plays any sound, any other type of program plays with sound, ive tried removing quicktime and reinstalling it but it still doesnt work, i have the latest version of it but its the not the pro edition, its the free download. whether its a video file or if its a audio file it never plays with the sound, any ideas ? i know its not my sound because everything else works fine with sound on my computer.