Mac: ‘Your system is infected with (3) viruses!’ Here’s the fix

Serhat Kurt for macReports:Do you see a popup message saying your Mac is infected with viruses? This popup message may appear in your browser (Safari or Chrome etc). Specifically this popup message says:
Your system is infected with 3 viruses! Our security check found traces of 2 malware and 1 spyware/phishing. System damage: 28.1%. Immediate removal required.The immediate removal of the viruses is required to prevent further system damage, loss of Apps, Photos or other files. Traces of 1 phishi