No helpful explanation, I'm afraid. Just a quick note of sympathy. Norton products are notoriously difficult to uninstall.
Are you aware that there's a special Norton uninstall tool that you can download free from Symantec?
What is ransomware and how do I protect my PC from WannaCry?
What I learned from my mentor, Oscar-winning VFX supervisor Phil Tippett
Siri vs Google Assistant