iChat 5.0.3 to AIM 7.5 video chat problems.?

[Netdude21]

I posted this same question on Apple's Discussion Boards and got no answer.

I could use some help, please?

I have a cousin that lives in another state and she wants to video chat with me and my mom.
My mom and I have Macs with Snow Leopard and iChat 5.0.3 and my cousin has a PC with Windows 7 and AIM 7.5. Both computers are notebooks and have Webcams built-in.

Whenever we tried to send a Video chat invitation from the PC to the Mac we would get a connection error on the Mac, but when we tried the same thing the other way (Mac to PC) and it would go through and we can video chat. I am trying to figure out how to make Video chat invitations work both ways, iChat -> AIM and AIM -> iChat.

I have gone as far as changing the IM server on the Mac to match the IM server on the PC. I then tried to change the IM server on the PC to match the one on the Mac and got a connection error on the PC, so I just reset them both to their defaults.

I even went as far as turning off the firewall on the PC but that didn't work either. Now I'm stuck and can't figure out what to do.

Any information you have would help me and my cousin.