Norton's AV and antimalware is notorious for false positives. And has been known for that for many years. Back 13 years ago when I was a computer consultant, I always steered my clients away from Norton's when I could. Oh, they were great the first few years they were in business, but eventually the bean counters took over and their software got less and less user friendly as they shifted their focus to huge government contracts and away from individual users.
I finally dumped Windows a couple years ago in favor of Linux so I'm out of the AV knowledge loop now, mostly, but what I'd suggest is a concentrated search effort to see what other people are recommending these days with an eye to replacing Nortons.
Last I remember, MalwareBytes was the best out there, with fewer false positives.