I recently installed Avast free version on my parents PC and now I'm looking for a free firewall to put on. I was going to go with Comodo but I've read a few reports of it having problems with Avast so now I'm back to thinking about Online Armor Free. I have read on another forum that OA Free doesn't update automatically, but my my question (or query) is why would it need to? I would have thought that a firewall was a rather solid piece of software and considering it isn't actually detecting viruses there would be no need to update it. If anyone could help me shed some light on this I would be most grateful. Or if people have any other suggestions for free firewalls that would be most helpful. Incidentally they are running Vista (Sp1 I think although I need to update this as well).