How to Get Rid of Error 678

1. Check the network cable running from the modem to the ethernet port on your computer. Make sure the cable is connected fully and is not damaged in any way. Replace the cable if any signs of wear are apparent.
2. Click on the 'Start' menu, then 'Run' and type 'ncpa.cpl' into the Run box. Press 'Enter.' Right-click on the 'Local Area Connection' and select 'Enable' to ensure your adapter is able to connect.
3. Disconnect the modem from the network cable and power source. Leave the modem unconnected for 2 minutes before reconnecting and restarting it.
4. Close the Internet browser and any other programs that are running on your program and shut down the computer. Turn the computer back on to reset all connections.
5. Install a virus-cleaning program on your computer and run it to find any spyware or adware that is located on your hard drive. Remove any of the software that the program detects to erase them from the computer.
6. Click on 'Start' then 'Run' and enter 'sysdm.cpl' in the Run box, then click 'OK.' Choose the 'Hardware' tab and select 'Device Manager' and then the 'Network Adapter.'
7. Right-click on your adapter, choose 'Uninstall' and follow the prompts until you have to restart your computer. Choose the 'Scan' option when the computer restarts to reinstall the adapter.