In my experience, antivirus software is the virus slowing down your computer, constantly bothering you with false positives like this and getting in your way.
As you are probably aware, there's nothing malicious in the PotM install files.
I don't use third party antivirus software, and I suggest for the sake of your own sanity that you unsubscribe if you are paying for it & do not reinstall it. 15-20 years ago, Norton may have had a good reputation among AV users, but no more. It is known to cause issues like this just like Kaspersky and McAfee. These programs fell out of favour over a decade ago because they caused more problems than they offered solutions.
Microsoft Security Essentials which came built in with your computer is more than sufficient; if you feel like you really need the extra security, consider MalwareBytes Anti Exploit which is free and has a stellar reputation.