Every search on a P2P sharing client would probably give you at least about a hundred results of a variety of file types. But did you know that you could get more than just free music downloads for MP3 players on P2P networks?
Spyware is one of the most frequently caught types of malware from P2P networks, and are notorious for drastically slowing down your computer. Aside from eating up system resources, a spyware application keeps tabs on your online activities and submits a log to a third party. Your identity and personal information are thus compromised by Spyware.
Adware is a less aggressive kind of Spyware because it simply spams your computer with unsolicited advertisements. Like Spyware, adware can also track Internet activities, although usually to not as far an extent.
Worms are a kind of malware that self-replicates, and is a scourge of the file sharing community. Instead of connecting to a third party or corrupting critical system files, they create disorder on your computer by rapidly copying itself, thus eating up much of your system resources. It will then attempt to propagate itself over the Internet using your memory and Internet connection.
The developers of P2P software, however, have been far from idle. Most of the mainstream P2P applications available now have one form or another of malware protection. BearShare, for example, uses its own network where things like RAR and EXE files cannot be exchanged. It might sound like a small trifle while going for Free MP3 Music Downloads, but it makes a big difference for your safety.