It is probably because you are trying to download popular files, hence the busy signal that your a seeing...kind of like all the guys that are constantly calling my daughter on the phone...and people wonder why I use cable and not DSL!!! Be patient, and you might get somewhere....also, do another search, and maybe another user who is sharing that file will show up....trying to download files that are being shared by multiple users also gives better success rates...

Good Luck, and Good Day