This scam is becoming more popular and can lead to your computer being further compromised by bad guys looking for more of your valuable client information. Be aware and don’t fall for this.
Below is the FTC’s guidelines for spotting a tech support scam.
Here is a common screen pop up message which is faudulent. Don’t call this number.
Here is Microsoft’s official post on what to do if you are a victim.
https://support.microsoft.com/en-us/help/4013405/windows-protect-from-tech-support-scams