Comodo Firewall Pro
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Full user review
I've downloaded the newest version and it seems to be every bit as good as the last one. After the initial "allow" popups, it silently works in the background. (After all, it's a free program so those complaining about the popups, remember that!)
I'm running XP Pro. with SP2 and am finding no problems as yet after using it for ages! I'm also running Comodo BOClean (anti-malware) and together they're great.
I highly recommend COMODO!
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