Just reporting in to say I deleted the original NPE I had from my desktop (meaning I now have the NPE built in to my current version of Norton). "No risks found" , it appears (and it makes sense) "false positive" was correct. Having TWO NPE's was clearly the issue.
(There was a MOMENT of seemingly odd behaviour during the scan, but odds are it was nothing, I've never paid attention to all those spilt second scan text bits before, so it will have seemed odd simply because I haven't paid attention to the process is all)
With a no risks found outcome and everything working/being/is fine I'm deeming the matter resolved. Thank you for your help.