MSE would be less of a drain on resources than Norton.
You could also consider Avast or Avira as the antivirus, but if you do be sure to add anti spyware such as Spyware Blaster and Malwarebytes or Spyware Terminator or Spybot S&D.
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
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