I agree with PParks1 & The Howling Wolves
Windows Firewall (WF) has come along way since XP, I no longer feel the need for third party firewall applications when using Windows 7 when it's WF does more than enough.
But having said that, the only third party one I'd ever go back to & recommend is Comodo, in their latest version it's very simple to use & setup.
I'm currently using MSE, MBAM, WF & CCleaner (For getting rid of junk/temp files).
I've yet to encounter a single problem since switching to WF & MSE.