If you receive a phone call from someone claiming to be from Windows or Microsoft, It Is a Scam. They will say you have malicious files and they need to clean them out, or they may tell you your Microsoft license has expired. (Microsoft or Windows operating system licenses do not expire) They may tell you that you have a refund due for some service. They will ask permission to remotely access you computer, and remove the file for you, give you a refund, or update your license. This is a total scam to get your private info. Once they gain access they steal your passwords and implant a Trojan allowing them access any time they want. Then they will attempt charge you for solving your fake issues. Have you ever attempted to contact a real person at Microsoft. Yeah! Do you really think they are going to call you?
NEVER CALL any phone number that appears on your screen claiming to be from Windows or Microsoft or any other company. These are fake warnings of infection or some other issue. These are All Scams!
If you receive one of these fake screen warnings call you computer repair company ASAP. You may already have a Virus. Do Not conduct any computer financial transactions until it is checked out. It would be best not to use the computer at all until it is gone over by a tech you trust.