Hi, there. I just wanna share about my firewall called "Zone Alarm", it's different from anti-virus and it's not.
I wanna told you about how great this firewall has keep my computer clean (very-very clean),
this firewall told you what programs is running in your computer and told you what programs that require a connection to external network and internal.
Remember the things like spyware, they need a connection to send information about your PC back to their home (i don't know where it is), if you using an antivirus, then you couldn't see what programs are using your internet connection.
But, with this ZA, you could see which programs and where do they headed for. You can just block it if necessary.
Just sharing. Correct me if i'm wrong