Is 7's firewall enough?

Hello,
I was wondering if Windows 7 firewall is enough protection at default settings? I would really love to NOT use a third party firewall. Thanks,
John

Mine works fine at default settings, but I'm sure you'll be getting a few suggestions anyway.

Yes, I'm behind a router firewall but not sure if it's configured correctly. It fails the grc leak test. Outbound I'm sure.

This is what it said. LeakTest was not prevented from connecting to the Gibson Research web server. You either have no firewall, you have deliberately allowed LeakTest to connect outbound, or (if neither of those), LeakTest has just slipped past your firewall's outbound "protection", if any.

Netopia. The only thing I can find for firewall settings is clear sailing, silent running and LANdlocked. The last one blocks everything. I have it set to silent running.

After setting the router to silent running, did you re-run the GRC leak test?

Yes. Same thing happened.