As you know p2p has been around since the begining of napster which popularized pirating music. As you know napster is no longer what it use to be but other hybrids of file sharing have popped up online from Bearshare, Limewire,Imesh, and ares. I won't get into the details of why its wrong to do it but I will say if you plan to use a peer to peer program to download music, files,movies, use a computer that is not used for logining into your email, or you bank accounts.
You can find some good p2p programs on download.com. The best part is that people place reviews on the use of them. I would stay away from just googling the p2p names I mentioned only because there are sites that can post as a clone p2p site and install some mean spyware thats hard to get off your computer.
The main lesson is if you plan to use a p2p don't use your own personal machine that has valuable pictures, or important information.
Also buy yourself an inexpensive hard drive at tiger direct.Western Digital WDH1B5000N MyBook Office 500GB HD Im recommend this site because for 1 they are inexpense and they deliver in a timely manner. External hard drives is just a simple way to back up your memories and important documents