Try uninstalling Norton AV and then reinstalling. If this fails try the helpline at Symantec. I had a similar problem once when I was using Norton 2002 on Windows 98, and the answer was a deletion of some files, but I cannot remember the details.
Samsung Galaxy S9 review
Wacom Cintiq Pro 24 and 32 review – hands-on
When is the next Apple event?
Qu’est-ce qu’Amazon Prime ?