Windows 10 says NIS turned off: NIS icon shows green tick and all OK

I keep getting messages from Windows 10 asking to turn on a firewall/antivirus etc.  I have Norton Internet Security installed.  The icon on the task bar shows a green tick and opening the NIS control panel shows all to be OK.  Going to Windows Control Panel Security and Maintenance shows that NIS is turned off!  So for that matter is Windows Defender.  Is there a way to resolve this conflict?