After using Comodo Ver 3 Pro FW which I did like but just found it too confusing etc, I decided to switch back to ZA Pro and now using 15 day trial on the latest Pro Version. I think its version 7 something. ZA is a FW you either hate or love and I was using ZA Pro on two previous PC's before hand (Windows 2000 Pro PC's) and to say the least I really do like this firewall and have found it to be one of the best FW's out there. I know people out there either love it or hate it. Sometimes there's an old saying that says "if your happy with something and it works well for you, than stick to it" I'm now using the latest version on my top of the line Toshiba Satellite laptop running Vista Ultimate and so far it's been going good, but like I said its a 15 day trial and if I like it I will buy a 1 yr license and see how I go.