I'm having a problem where on many of my video files the audio lags behind the video by as much as a couple of seconds. It's really annoying and I've tried playing the files in Real Player, Windows Media, and the DivX Player yet the audio still lags in all of them. It seems to happen most on AVI files. I have a new Dell, 2 gb ram, 3.1 ghz processor, I just don't understand how this can be happening! HELP!