Anti-Virus for MacPro ...
I've already called our ISP (Charter). They told me there is nothing they can do, since I use my own router. I called D-Links, and they helped to set up a secure connection. I asked them about setting up a second level of security (recommended by Charter), but they told me I didn't need that, and refused to help me with the MAC ID Filtering (recommended by Charter).
I called Apple Tech Support and they helped me to adjust some other settings (Firewall on, Sharing Files off).
I just want to have the maximum security to hopefully stop whoever is hacking and downloading illegal files ...
MacPro 2.93GHz, Mac OS X (10.6.6), 8GB RAM