Norton Internet Security for Mac

Norton 360 for Mac
1

Dear All,

I have a Mac OS X El Capitan Version 10.11.1, MacBook Pro (Retina, 15 inch, Late 2013).

The following two Norton messages appeared:

"Could not check coverage for Norton Internet Security.  If this error persists, please try re-installing Norton Internet Security."

"Could not communicate with Norton Internet Security.  The Norton Internet Security background application is not running.  You should re-install Norton Internet Security."

I would appreciate advice on how to proceed.

Regards,

Billy Smart