First of all thanks for reposting minus your personal data. I understand your frustration and hopefully we can figure this out.
"I had Comcast/Xfinity Internet for quite a while with Norton anti-virus supplied to me through Comcast. I canceled the Wi-Fi for A period of time eventually turning it back on...."
By the above do you mean that you cancelled the Internet portion of your Comcast product? I ask as canceling Internet will also terminate your free Norton coverage and actually invalidate the PIN used to control your Norton product. That is why Norton said, "Comcast had Cancelled my pin".
The following link may help you:
If not, please let us know where in the instructions things went astray.