He said his name is Sam and started talking about donating to a fund for disabled veterans before I hung up. I called back and was told to press 1 if I'm not interested in their special promotions.
There is apparently a network of these dirtbags that are calling people and posing as employees from Microsoft saying that your computer is showing a virus infection or some such and proposing to walk you through activating remote access. If you are fooled by them, they will lockup your PC and demand a ransom to unlock it. The caller-id they use is spoofed (faked) using voice over internet protocol so it's untraceable. Don't be fooled by this scum scam. These people are lower than whale dung.