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[Krosus78]

O.k you cant just dump the 360 into the pc to get it going, you need to at least enable internet connection sharing for the usb modem's connection which will then assign the 360 an IP address and NAT it so it can go out on the internet, otherwise all ya have is a LAN and no net access.
Alternatively buy a Router, has handy hardware firewalls etc but will cost you whereas ICS is free .

[hhsweatherman]

I already have it shared, because I used it that way with the first XBOX.  I also turned all my firewalls off and it continues to do it.

[hardcandy]

The easiest thing for me, since I had two bedrooms with wireless computewrs and game consoles and a living room with a media center computer was to buy the Zyxel Wireless P330 router at Compusa for $49. It is configured to either be a router, a bridge, or a gateway. I use it in the bedrooms as a bridge. It has 4 ports. It connects to my main wireless router in the living room. I have 2 computers and an xbox in one bedroom connected to it and a desktop connected in the other bedroom. I do not have to worry about my main computer being on all the time so I can use the other computer or the console.Also, this means I have two backup routers in case the main one breaks down. And $49 for a wireless/gaming bridge is cheap. It works well and has good range.
Compusa/Zyxel
usually the stores have them in stock. ICS is free but it can be limiting when you are using the main computer and want to use the console as well.
In answer to your original question, what is the subnet for the xbox360 set at?