Microsoft will never call you.

I know computers are scary, magical things, but please don't give phone scammers who pretend to be Microsoft tech support any of your time at all. Hang up. YOU make the call, if you suspect there's something wrong with your computer. I mean, if somebody just showed up at your door and said "hey, there's something wrong with your fridge, let me in." Would you? Hopefully not.

http://www.cbc.ca/news/canada/british-columbia/microsoft-tech-support-scammer-recorded-threatening-to-kill-b-c-man-1.2980453