Mac iChat to PC AOL AIM AV: PC firewall questions

Question

I've got a PowerBook G4 with 10.3.9 and iChat 2.1 (v 153). Unfortunately most of my relatives use PCs. For the last few Christmas' and Hanukkah's my wife and I have bought our family web cams so we could AV chat.
However, only my sister has had any luck using her webcam and that was only after she had a friend come over and set it all up for her. The usual snag seems to be the firewall on the PC end (both the Windows firewall and the Norton and/or MacAfee firewalls).
Is there a set of instructions somewhere (for novice PC users) that gives instructions on what ports to open and how to do it for PCs? If so, could someone post a link here or give me a set of instructions that I can forward to my relatives?
Thanks.
PowerBook G4   Mac OS X (10.3.9)  

Answer 1

So far I don't have any solid answers, but for anyone interested, I got this reply from my sister about what she thinks was done to her PC's firewalls:
OK - for the audio - go into the camera icon and to the camera control panel and under audio make sure the microphone is selected and is the default. That's also where to control the volume.
Firewalls - open the fire wall information - I clicked on Fire Walls at the bottom and go to exceptions and make sure the camera is checked as an exception.
Then there's this link I found amoung this Discussion board that gives some information on what to do to firewalls
* http://www.aptr36.dsl.pipex.com/page12.html
Specifically this part:
What to do with AIM on a PC to get it working
First of all find out if the PC has been upgrade with the SP2 Service Pack.
Service Pack 2 is a recent major system software update to Windows XP Home and Windows XP Professional.
Updating a Windows XP computer to SP2 may cause Mac iChat AV to AIM 5.5/5.9 PC video and audio connections to fail because, by default, the firewall created by SP2 blocks UPnP communications from the Internet.
If the SP2 firewall is enabled:
1. Go to Start>Control Panel>Security Center>Manage security settings for: Windows Firewall>Exceptions tab> add or check UPnP Framework as an Exception.
1. You can go straight to the Firewall Control Panel [Start>Control Panels>Firewall]
2. Use the Add Button and Add the AIM appliction.
2. Select UPnP Framework and click the Edit... button.
3. Be sure that both the TCP 2869 and UDP 1900 ports are checked and listed as 'Any' under Scope.
4. If the Scope of each port is listed as 'Subnet,' click the Change scope... button, and select the 'Any computer (Including those on the Internet)' radio button. Do this for both ports, and then save the changes by clicking the OK buttons.
This is another link that has some information:
* http://discussions.apple.com/thread.jspa?threadID=121845
Any other help is welcome. Thanks.