Chopy or not visible files

Hey guys I just got an iBook. Now I've been downloading things on Bit Torrent, but the quality has been kinda shady. I mean either I hear the audio but I get no visual. It has also been shady on my PC, its either chopy visual if any. Now I don't know if my computers are screwed up or what... but it seems to happen alot lately with certain files, while the old school ones I have seem to run fine. Anyone one know what's up?[img]i/expressions/face-icon-small-confused.gif[/img]