Norton Commander was great too and Peter Norton wrote the book on programming the IBM PC.
IIRC Norton AntiVirus was a rebranding of Symantec's antivirus software and probably the first usage of Norton's name for marketing reasons whereas NortonLifeLock is the last.
Was? It still is! Used it two weeks ago when I had to copy some files to my DOS retro machine and I could not be bothered to re-learn the xcopy syntax after all these Linux years :)
Mignight Commander is still my preferred file mamager on Unix.
Oh, I'm very sure about later products and "great" would not be a descriptor I would use.