I have quite a problem. I downloaded a video file off of Limewire (Lost) and now none of my files sound will play. Even ones I knew worked before. I tried files that I didn't download (windows sample things) and they did not work either. video display works but no sound for music files or anything. It seems I may have got a virus or something. I have tried everything. Itunes isnt that great it wont play video at all. What do I do?!?