The reason you are seeing
“VIRUS ALERT FROM MICROSOFT” Scam warnings is because of an adware infection. This is a classic tech-support scam that attempts to scare users into calling certain numbers where they would be requested to provide remote access to their OS. If an advertising-supported program is indeed responsible, expect highly invasive adverts. An advertising-supported software may commonly be found together with free software, and if it goes unnoticed, it will be authorized to install. The adverts are not going to harm your PC, as long as you do not call the con artists. The con artists on the other side of the phone will request remote access to your machine, and then try to make you believe that they have repaired the issue (which does not even exist in the first place), for which you would be charged. Not only should you never call the numbers in these suspicious advertisements, you should also never permit access to your operating system to shady people. And if you are still concerned about the advertisement you are getting, it's not real, and neither your system nor your information is in danger. When you remove “VIRUS ALERT FROM MICROSOFT” Scam, the alerts should go away, and you will be able to go back to normal browsing.
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