Nothing from Norton will ever be on this machine again.
I can't put it more succinctly than that.
Literally YEARS of running Norton didn't find that old email attachment in my ancient PST file...so old it was via martinp@smart.net.au [provider is LONG gone - 3 years or so]....BitDefender found it...and removed it.
I'm still running the 'trial'...it took forever to do a thorough scan of my half million files [or there abouts] on 4 physical drives ....350 gig or so ...but I'm fairly confident it's all cleaner than it was...