Thank you Juju and Shunks.
Do you know what NetBIOS is? What does it do? My firewall said it "intercepted and blocked" NetBIOS. Is this good or bad?
Back to the Activity Log...
It shows that it has "blocked incoming and outgoing TCP", "blocked outgoing UDP", and "blocked incoming ICMP". What are these things and is it good that this stuff is being "blocked" by my computer, or should my settings be changed?