Hi - I have the exact same problem as this thread that was solved: https://community.norton.com/en/forums/norton-internet-security-cant-be-...
The problem is the solution was sent in a private message, so I can't see what it was! It seems I need an older version of RNRN but can't find one.
Basically, I'm missing an inststub file in old Norton, and when I download NRNR it says it is corrupted, and won't work. There is simply no way to remove it, and without doing so I can install the current norton!