Just configure Zone Alarms properly - it won't bite!!!
Got to the Fireall settings and then zones and enter the addresses including the ap that you want the Firewall to let through.
Then take a look at Program Control Program tab. Make sure you have a tick in the right boxes. Make sure that Generic Host Process for Windows has access as well as your Firewall - but preferably not server access otherwise the likes of Norton take over the computer. It is also how you stop Real F.... Player invading!!
If you want a safe easy way of doing all this uninstall and reload ZA. It will then prompt you to accept or deny all the connections including your wirelessly linked computers.