Disable ICS (Internet Connection Sharing)
If you have previously enabled Internet Connection Sharing (ICS), and you decide to use a router instead of ICS to share an Internet connection among two or more computers, you'll need to disable ICS.
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Open Network Connections by clicking the Start button 
, clicking Control Panel, clicking Network and Internet, clicking Network and Sharing Center, and then clicking Manage network connections.
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Right-click the shared connection, and then click Properties.
If you are prompted for an administrator password or confirmation, type the password or provide confirmation.
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Click the Sharing tab, clear the Allow other network users to connect through this computer's Internet connection check box, and then click OK.
