Microsoft and it's partners NEVER call you, unless you've called them or submitted an online ticket to them, first. This was a scammer. Also, Microsoft does not monitor everyone's computers for "errors" or "viruses". I hope you didn't give the caller remote access to your computer, otherwise, it's a sure thing your computer has been compromised - malware/spyware/keyloggers downloaded, personal information stolen, etc. If you DID give access, please take your computer to a bricks and mortar computer repair shop so they can make sure it's OK - worst case scenario, they may have to reformat the hard drive.
This piece of slime called me. I know that Microsoft never calls people so I just started singing Happy Birthday, Twinkle Twinkle, The ABCs, the theme to the Brady Bunch. I have also gotten them where I make suggestions about painful ways that he can die. The singing made him hang up the fastest. I'm insulted.