The scam is very simple: someone calls you claiming to be from Microsoft or your ISP or your anti-malware provider, or some other authoritative company. Of course, they are not. Microsoft, your ISP or any of the other companies these scammers claim to be from are not involved in any way.
They claim that they’ve detected that your computer is causing many errors on the internet or that there are “problems with your account”. To prove that there’s something wrong, they ask if your computer has been crashing recently. Or they have you open up the event viewer and point out the many, many errors listed there.
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