Pop-ups purporting to be from McAfee & others saying my PC is at risk

Many pop-ups purporting to be from McAfee & others saying my PC is at risk, or infected, or the carpet of the system is hacked, or critical system error, critical virus warning, or your system is damaged, etc. All want me to click on "remove virus now", or "quick scan" or some such. Just started night before last, and has become worse, now every few minutes. What's happening?? Someone please explain and help! I have screenshots if needed.

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