How can I prevent "antivirus" popups?

Today I set up a new laptop PC and initially it came up with Microsoft Edge.  I downloaded the Brave browser and made it my default, but I keep getting annoying popups in MS Edge from McAfee, telling me I have 3 viruses on my PC.  I have run Norton 360 scans three times, and it says my PC is clean.  I also get recurring popups for Norton Antivirus ("at only $19.95 ... for the first year").  Why am I getting these annoying popups, and how can I make them stop?  If I have Norton 360, why do I need to get Norton Antivirus?

I think I may have solved my own problem.  I turned off all notifications from Microsoft Edge.  We'll see if that does the trick.