ZoneAlarm Free Antivirus+Firewall
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Full user review
"Helps keep everything your computer does under control."
Anything that tries to access my networks, or even run files by itself, Zonealarm warns me about, and it's saved me from many a malware attack over the years by letting me know about some hidden program that downloaded itself trying to launch & access the Internet, allowing me to investigate it and remove the offending program before it could try again (while Zonealarm thwarted it from accessing anything to begin with). The free antivirus is just icing on the cake.
Can sometimes cause issues when a game updates, with the Allow or Deny window for the updated program's attempt to access the network popping up underneath the full-screen game, making you have to hunt blindly for the Allow prompt. However, that's more my fault than Zonealarm, as they do have the Game Mode for that very reason, if I can ever remember to turn it on when appropriate. :P
I've used Zonealarm for a long time, since before it added firewall capability, and I've always enjoyed the added security it gives me in addition to the hardware firewall presented by my router. I suggest an installation of Zonealarm on every computer.