Pop up says virus detected, and Norton is no longer active

I keep getting a pop up on computer that says Noron and MaAfee have noted virusus, and want money to fix. Also says Notron is no longer activev. abstract:

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Hello @Ron_Evans

How To Remove Fake Norton Pop-up Alerts [Virus Removal] here

Your browser displays fake McAfee notifications here

Don’t Fall for the McAfee “Your PC Is Infected” Pop-up Scam here

How to Remove Fake McAfee Virus Popup Notifications here

McAfee Popup Scam and ‘Removal,’ Explained here

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Remove Fake pop-up or tech support scam messages that warn the computer is infected here

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Did you clear browser cookies n cache?
Do you run browser sync?
Did you recently install any program / browser extension?
Did you recently allow push notifications?
Did you recently change site permissions?
Did you run Norton Full Scan?
Did you run Malwarebytes Scan?