Hello @Dave_Sage
Norton 360 v22.x or v24.x
Please review:
https://community.norton.com/t/pop-up-your-pc-might-be-at-risk/240268
How To Remove Fake McAfee Pop-up Alerts [Virus Removal]
https://malwaretips.com/blogs/remove-fake-mcafee-pop-up-virus/
Don’t Fall for the McAfee “Your PC Is Infected” Pop-up Scam
https://malwaretips.com/blogs/the-mcafee-your-pc-is-infected-with-5-viruses-scam