I have a few mp3 files that are not playing anymore with iTunes and they play normally with windows media player. I have iTunes 9. I tried converting them to AAC and get a (-50) error. The last time I listened to them was 9/9 after I installed iTunes 9 so I have no idea what happened to them. When I checked their infor, I noticed that the album cover had also disappeared. Can anyone tell me how to fix this?