What is the best p2p that is free, i used to have ares but no more since i have to register it.?

Limewire. Many people use it, but, the only thing you may run into is viruses/spyware, that is if you don't understand computers well(Viruses, P2P, Hardware, etc.) but, if you get a good anti-virus that is set to automatic updates, you should be fine.