Missing sharing tab on network properties

I have an ADSL connection, connected to my PC via ethernet(NIC 1), and a wireless connection(NIC 2). I want to share my internet connection over a wireless network.

The problem I have, is that I do not have a sharing tab in the properties on my Local Area Connection. I only have a sharing tab on my wireless connection, which is useless as that is not the internet connection.

This is a fresh install of Vista, and everything else is working fine. Latest drivers etc. Before installing, I did have a sharing tab. I can not find any option to enable it.

How can I get it back?

Do you have any other network interfaces defined? If the interfaces have been bridged or shared that tab might disappear.

Also, make sure the ICS service is running on your machine, if it's stopped the tab might disappear.

More information could help in figuring out what's wrong.

Click Start -> Run... and type cmd

In the command-prompt type ipconfig /all and post the output of that command. It might indicate what's wrong.