We have been getting a lot of calls and visits lately about people receiving phone calls from "Microsoft" telling them their computer is infected, their Windows license is about to expire, etc. These phone calls are SCAMS. There is no way that Microsoft would know if you had a virus or some other malicious content on your computer without being at the computer and, honestly, they really don't care if you have a virus on your computer because it's not their problem. It is possible that the scammers tell you that you have a virus on your computer and you do actually have one, but you should never trust someone you have never met with information regarding your computer, let alone someone who calls you out of the blue.
How do I get the scam calls to stop? There really is no sure fire way to get the scammers to stop calling you because as long as they have your phone number they can call as many times as they want. However, once they realize they aren't getting anywhere with you they will give up and move on to the next potential victim. Your best bet, if they are calling your cell phone, is to block the number that called you so that every time that number shows up, you can block it from ringing your phone again. The other option, if you aren't sure how to block the number, is to answer the call and tell them that you know they are fake and that you are going to report them to the authorities. Eventually the scammers do get caught, but the people who don't get in trouble simply start a new scam call center and start all over again. Unfortunately, it's a never-ending cycle for scam calls, but as long as you can detect when they are fake and how to handle it you should never get caught handing them money, or letting them into your computer.