Now that I have Windows 7 64 bit, I have abandoned PC Tools. It wasn't creating rules correctly and in some cases, not at all. It refused to create rules for many 64 bit apps, in particular CCleaner. I submitted the problem to them and they replied by saying that the firewall had known issues on 64 bit systems and that my problem was caused by a conflict with the Web Shield of Avast. They advised me to disable the shield which I was not willing to do. I am now using the free version of Windows 7 Firewall Control and I'm very pleased with it. A strong two way firewall with no HIPS was just what I wanted.