I have a bunch of video files that I transferred to my external drive to watch on my ps3 last year. So far every one has worked perfectly fine until now. Now there is no sound when played on the ps3 and when I plug into the laptop or use the HDMI cable, there is sound but the voices are out of sync. They are AVI files and the drive is Toshiba. I am running on windows 7 home premium in case that gets asked. Please help with any advice.