If you try to connect to Ethernet and get an error such as “The DNS server isn’t responding,” first reset your modem and router by turning them off for 30 seconds. If that does not fix the error, you need to re-install your ethernet network adapter. To do this type in Device Manager into your Windows search bar and open the Device Manager.
Next right click on Realtek PCIe GbE Family Controller under Network Adapters and select uninstall device,
After this it may restart the computer/prompt you to restart to complete the re-installation, OR, it will just uninstall the drivers without needing to restart
If the process requires a restart, the drivers will be automatically re-installed when the computer is booted back up. If the process does not require a restart, click on the Screen and Magnifying Glass button at the top of the window. This will rescan for the software and automatically reinstall it.