I have a home networking system consisting of 3 computers and using a "Sky" router connected by three "TPLink" Powerline adapters (which use the house wiring system to connect the computers) The system has worked well for years. However I recently re-installed Win 7 on one computer and now cannot connect to the internet on that computer? When I try to connect Windows informs me to "Install a driver for your Network Adapter" and that" Windows did not detect a properly installed network adapter. If you have a network adapter you will need to re-install the driver". Since the TP Link 411 is a simple "Plug and Play" device which routes the internet from the router to the computer I cannot understandthe need for the additional network adapter? Any assistance would be much appreciated. Cheers.