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First in Start Menu right click on My Computer and click on Manage.
At the left Tree View click on Device Manager.
at the center Tree View on Other devices right click on your Ethernet adapter and click Uninstall.
after Uninstall at upper menu on Action Menu click on Scan for hardware change and when your Ethernet adapter recognized wait for windows prepare to install the driver.
at first page of installation click on no thanks(because you have no Internet Connection!) and Next
after that click on Advanced and Next
and then click on Don't Search and Next and at next page chose Network Adapter from list. and Next then Chose the Manufacturer of your Network Adapter and the Network Adapter type.and Next. If you see a message box click yes and wait for your driver to install and last you have your driver.