Xmembytes Antispyware can protect your PC if you have DSL or a cable modem or if your IP address is permanent. Although this has benefits, it also carries the serious shortcoming of rendering your PC vulnerable to attacks. A firewall, in this respect, becomes not just desirable but a necessity. You can block uninitiated and unwanted traffic, even while your PC is unattended or while you're not using your connection. You can also limit your exposure to attack by specifying which applications can access the Internet. The program also lets you stop e-mail-borne Visual Basic Script worms.