I called the number for Norton that someone had posted previously.
After I explained that I followed the online "fix" by uninstalling and then
re-installing and still got the error message. The Tech Rep told me that
Norton is experiencing a lot of this technical glitch & they are working to
solve this problem.They said wait 24 hrs & call back if it still does it.

Somehow knowing that a lot of other people also are experiencing this
same problem, does not make me feel any better.