Bridging connections on my Dell Optiplex 755 computer

I came to bridge my Ethernet and my wireless together, in order for me to get on xbox live. For some reason it will not let me bridge, and I don't know what to do, please help.

Following this tutorial should help.
Network Bridge - Add or Remove Network Connections

As for the Unidentified network problem, going through the steps in the link below should help you fix that problem, you should do this before creating the bridge.
Windows 7 Unidentified Network, Limited Access, No Internet Connection Problem Resolved

Thanks for the reply back, but i can't even create a bridge, shown in the image above.

Did you make sure that neither of those connection has internet sharing enabled?

Yes, would i need some kind of driver?