http://blogs.technet.com/keithcombs/archive/2007/08/18/windows-vista-product-guide-screencast-windows-firewall.aspxA firewall is a critical first line of defense against many types of malware. Properly configured, it can stop many kinds of malware before they can infect your computer or other computers on your network. Windows Firewall, which comes with Windows Vista,en-USCommunityServer 2.1 SP1 (Build: 61025.2)