I use Windows Firewall, behind a hardware router firewall too. Double security. Even before I had DSL and a router, I used Win Firewall.
Only time it gives me a pop-up, is when something tries to access, that hasn't been set as allowed/disallowed yet. ie: When I installedand ran BF1942 for the first time, it popped up and asked "What do you want to do?". Hasn't popped up since.
Win Firewall DOES NOT block things from going out of your computer, only things coming in. So it will block a hacker from coming in, but will not stop a trojan from sending something out. Therefore I would only recommend Win Firewall on its own, if:
- You know what you are doing, and regularly run AV, Spyware and Adaware programs, and know how to spot a potentially harmful file, prior to downloading it.
AND/OR
- You already have a hardware firewall, and just want a little bit of extra protection.