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Hi, I'm Mr.med. Welcome to JustAnswer. I'm reviewing your question now, and will post back with your reply ASAP.
I am sorry this has happened to you. This is a scam. Please DO NOT call or let them have access to your computer, as they are probably installing spyware and other malicious items. Report them to Microsoft :
press and hold the power button on the computer until it turns off and then turn it back on. Once it is back on, that pop-up message should be gone.