Norton Info Alert - You have turned off your antivirus protection

I keep getting a Norton info alert box that pops up telling me that:

 

You have turned off your
antivirus protection.
Your PC will be vulnerable
to viruses and other threats.

 

Does anyone know why this is happening?

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I'm running : Win XP // Norton Internet Security version 19.7.1.5

 

When I bring up NIS it says "System Secure."  What explains this divergence of status?