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This article will help you reinstall a network adapter (NIC) in Windows 7.
Locate the Windows Menu in the bottom left corner of the task bar.
Select Control Panel from the Menu.
Click the System icon to proceed.
When System and Security is selected from the Control Panel view, select Security.
Click Device Manager from the left hand menu list.
The Device Manager will display all installed and “found” hardware on the computer.
Find the Network Adapters Category and click the "+" to the left.
The Network Interface Controller(NIC) will be listed if installed. Right click the adapter used, select Properties
Navigate to the Driver tab in the NIC Properties.
Selecting the Uninstall button will remove the existing driver from the device manger.
Confirm the Uninstall.
Return to the Device Manager, select the Scan for Hardware Changes button. The NIC will reinstall automatically.