Needing Expert Help... Red Alert 3

I have always loved the C&C series since I first played the first one years upon years ago. I have a problem though and it's Red Alert 3. It's a first for me because out of all the games I have owned this is my first one with a problem that I can't seem to be able to fix.
On Campaign / Co-Op I'm getting a Cannot Connect to BackEnd Server. Another wierd thing is that I cannot connect to http://profile.ea.com/ which would normally suggest to me that it is on their end but this time I know it's on mine. For some reason I cannot connect. I have disabled my firewalls and tried forwarding the ports but still stuck.
My son's computer has no problem connecting and they are going through the same router so I'm even more puzzled.

My Computer:
OS: Vista Home Premium 64 bit
CPU: Phenom 9600
MB: Gigabyte 790FX
GPU: 3870
Network Address: 192.1.1.64

Sons Computer:
OS: Windows XP 32 bit
CPU: AMD 5400
MB: Gigabyte 780G
GPU:4830
Network Address: 192.1.1.65

Router:
Verizon
GT704WG

I'm not a huge Networking guy so I use Network Magic to help simplify things. Everything has been defaulted back to it's original state. Any additional information you want me to give but pretty much I'm putting myself in your hands. I would like to go through a step by step process and ideas on why this is happening would be awesome.

I have no idea. I'm not a huge Networking guy which is why I use Network Magic. I'm willing to learn but will need some hand holding on this one. This has me really baffled.

I'll try the other modem out tonight when the kids head to bed.
Edit: I have to find the power cord for my other modem so might be a day or two.
What I did do is shut the Router off and unplug one of the network cables and then ran a test on just one computer being hooked up. The XP could communicate and the Vista one couldn't. I'm going to try a new install and see what happens.

It could be that you have ECN enabled. To disable it, run Command Prompt as administrator and type the following: netsh interface tcp set global ecncapability=disabled

Hey, I remember this problem and it was something so simple. I had the ISS or something turned on when it shouldn't have been. I have no idea why it kept me from connecting but man it was a pain. The reason I found out was because I was installing an Apache Server and it was conflicting with it. Thank you to all the people who helped.