Network Adapter Troubleshooter

How to Enable or Reset Network Adapter in Windows 7

Follow the below steps

1. Click on Start button , and then select Control Panel. In the search box, type adapter, and then, under Network and Sharing Center, click View network connections.
   
2. .Right-click the network adapter icon, and then click Enable.  If you're prompted for an administrator password or confirmation, type the password or provide confirmation.