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Hello and welcome to justanswer. My name is***** will be assisting you today.
That is a scam message.Do not call or give them access to your computer.There are lots of such scam going on now a days which you can find on this link: - https://www.microsoft.com/en-us/security/portal/threat/supportscams.aspx . You can also report it to Microsoft using this link: - https://www.microsoft.com/en-us/reportascam/
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