I continue to get a LOT of calls about this. NO, DO NOT call any phone numbers that just pop-up on your screen, regardless of how legitimate they look or sound. Companies, including Microsoft or Apple would never contact you in this manner. The only call you should make, is to me so I can guide you on what steps you need to take to solve this problem.
Again, DO NOT CALL ANY 800 NUMBERS that pop up on your computer screen or let anyone take control of your machine.
Call me and I will advise you on what you should do.
Safe computing. Mark :-)
Here are a couple of examples: