When you use a Peer2Peer program to exchange files, like eMule, Kazaa, Shareaza, Kazaa Lite...you are exposed to spyware from other IPs via some ports that remain open.
P2P Hazard is a powerful protection against these techniques, potentially dangerous, and that could access your system. The program blocks these IP ranges and/or ports and keeps you safe from spies.
Without doubt, P2P Hazard does what it promises, consumes few resources and can start automatically with Windows, so you'll have it always running.
P2P Hazard is also available in languages, it is free and has no adware or spyware. Could you ask for more? Absolutely recommended.