If you’d like to try another firewall than the build-in: a good, free one is ZoneAlarm. I installed version 7.1.248. Solid and no problems at all.
On the contrary Comodo Firewall Pro showed too much pop ups; it looked like they would never stop. Even removing the thing was a pain. The standard uninstall left a lot of crap. If you want to get rid of it, see here.