>>>I am receiving requests from Microsoft
I'm prepared to bet that those messages have nothing to do with Microsoft! Clicking the link offered will probably do something really nasty to your computer.
However the malware that's generating the false message should be easy to eliminate. Download, install and run the free version of Malwarebytes Anti-Malware:
https://www.malwarebytes.org/antimalware/
(NB: When installing it, take care to remove the tick which will appear next to an option to take a free trial of the 'Premium' version). Don't be surprised if a scan takes ages to run. (That's normal). When malware is identified, select the option to 'Quarantine' it.