Hi forum friends.
I just ran the new Comodo Pro FW download over the existing one. No problems on my XP whatsoever. Just a few things work a little differently, you have to grant installer status to some programs that like to do something to your dll's, when you are accustomed to these little alterations, no big problems, less prompts, starts better, easier and faster. No problems with vidalia, Tor and Privoxy.
I am glad had to say goodbye to ZA to get to know Comodo, and yes you have to learn to tweak this beast and understand what you set it to do. Very versatile,
pol