EHM The Blue Line

First off I know that there are posts about EHM online, and yes I have read them. But my problem isn't covered in those posts, and I've tried asking a few different people, before I ask here, but they tried and failed, as they didn't know what EHM is. Anyway, I'm on a laptop, which I use wireless internet, and it gets the signal from the main computer.
Speedstream-6520 Thats the Modem
Netgear WG11V2 54Mbps Wireless USB Thats the wireless

I opened the ports needed, and I have turned the firewall off, but it still says "EHM online game can't be created" or something similar.
So I went on the main computer to see if it worked on there, and without a word of a lie, I did nothing, started up EHM clicked on Start new network game, and it worked, that really confused me. So I am now, really stuck, I would play it on the main computer but its never available because other people are on it, and I want it to work on my laptop as that is where all my things are and my up to date EHM.

Any suggestions or advice would be greaty appreciated.

PM me for my msn or something if you like.
Thanks.

Regardless of whether there's already a topic, please use a more descriptive post title. This will not only help people in the future but it will also attract the attention of others who may be able to help you.

I actually have the same problem, but it's not when I create my network game, it's when I try to connect on the game of one of my friends. We both have a laptop with a wireless connection too, so I should like to have an answer if someone can help me. Thank you for your help