Comodo Firewall Pro
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Full user review
"Works great, but locked me up! (so it's too good then...?)"
This firewall had a learning mode, installation mode, scanners, asked about everything, it's great for a free firewall! Never used a lot of resources, and never had the computer slow down or freeze up from it.
The last software update for this program had locked up ALL of my programs, and I had to uninstall it to get my computer to work.