You probably know that you need a firewall program to use the Internet safely. In addition to protecting you against attacks from the Internet, a good firewall will also tell you when programs installed on your computer are trying to phone home and enable you to prevent them from doing it. This is something that Windows® own firewall doesn’t do, and it’s essential for identifying and stopping the activities of many malicious virus and spyware programs. For example, this enables you to prevent your computer from being turned into a "zombie” controlled by spammers or destructive hackers.

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