A. Yes. If you have more than one computer in a home or small-office network, you should protect every computer in the network. Enabling the Internet Connection Firewall on every connection will help prevent the spread of a virus from one computer to another in your network if one of your computers becomes infected. However, if a virus is attached in an e-mail message, the firewall won't block it and it can infect your computer. You should install an antivirus program as well.