People often ask about the best way to configure their computer to protect against threats, such as worms and Trojan horses. They say they have installed antivirus protection and never open unexpected email attachments.
But they wonder if that is enough. Antivirus protection is certainly an important part of an effective protection solution. It has the ability to detect known threats as well as many new ones via heuristic technologies. But the reis a second technology that can be added to help complete the picture: a firewall.
While antivirus software helps to protect the file system against unwanted programs, a firewall helps to keep attackers or external threats from getting access to your system in the first place.