>because it gets it everything
This is a bit vague, not sure it means anything.
Limewire (and similar programs like Kazza) are peer to peer programs. This means that anything you download (music, programs etc) is stored on someone else's computer somewhere in the world. It may be in Australia, the USA, Russia, Brazil etc. This is from ordinairy computers like yours and mine.
Because it is from ordinairy computers it may be that some of these people want to cause harm to your PC (for a "laugh").
So they may say a file on their PC is the latest single by Beyonce or Take That, but in fact it may be a program and if you run it then it will put a virus on your PC (or a keylogger to capture every keystrike you make).
Note also that if you download a song and it is on your PC, then if someone else is looking for that song (in Brazil, USA, Russia etc) then they will upload it from YOUR PC.
Do you really want somone you dont know in Russia uploading files from your PC?
Limewire is VERY VERY risky.