There are many reasons for this problem; one of the reasons is that Windows Update failed to install or update the Network drivers, in that case, you have to update the required driver manually.

Like any other device in a computer, you cannot use your Ethernet adapter, or network card, unless you install a device driver for it. Generally, computers running Windows 7 should install most ...

Click the Select Old Drivers button, and the tool will automatically select all the drivers that are safe to remove and show ...