Cannot turn on Norton Internet Security

I have a five month old laptop and I purchased Norton protection.  Today there was some virus that attacked.  I realized both Norton and Windows Defender were off.  I reset the computer to an earlier date and was then able to turn on Windows Defender.  I ran a full scan, found a virus, and cleaned it up.  Everything seems to be working fine now except that I still can't turn on Norton.  And, the Norton website updater can't even find it on my computer.  I tried to do the re-registration trick listed on a help window for "Norton Internet Security reports that it is turned off."  What do I do?

I have a five month old laptop and I purchased Norton protection.  Today there was some virus that attacked.  I realized both Norton and Windows Defender were off.  I reset the computer to an earlier date and was then able to turn on Windows Defender.  I ran a full scan, found a virus, and cleaned it up.  Everything seems to be working fine now except that I still can't turn on Norton.  And, the Norton website updater can't even find it on my computer.  I tried to do the re-registration trick listed on a help window for "Norton Internet Security reports that it is turned off."  What do I do?