Firewall settings for home network

I use F-Secure Client Security 9.31. My problem is that the computers I use at home in my wireless network do not see each other. Enabling all network activity solves the problem, but I do not like turning of the firewall. So, obviously I should form some sort of exception rules for F-secure - but how do I do this?

Both my computers run win 7. I have defined the network type as home network and the computers belong to the same working group (I have, however, not attempted to form a home group)