Haven't installed a FW yet. What ever Windows 7 has is what is enabled and have yet to hear a peep from it. I haven't even tried to open/adjust it either. Years and years ago (like eight or more) I used ZoneAlarm, then used Online Armor and Comodo for several years. Lately I've been using PFW on the retired desktop and Comodo on the laptop. I am behind a router and thinking of just sticking with Windows. What do you think? Thank you!