Norton is trash. Utter trash.
Unfortunately, false positives are quite common these days with any AV. Essentially, you are seeing the weakness of definition-based systems combined with "global whitelisting", and it's not going to get any better soon. In my opinion, current AVs are only of limited use, anyway, as no AV has all that good performance vs. "zero-day" exploits and malware.
I've found that I get better results without the RAM and CPU overhead from a stateful or on-access AV, by running Comodo's "Defense+" heuristics protection module. I haven't acquired any malware infections in 3+ years, so...