Number called claiming to be Windows Tech Dept., telling me my computer was constantly sending error messages indicating I had viruses, spyware, and possibly Trojans. It's a scam wanting to get credit card info for the fee to clean up your computer remotely, so remote access into the computer too. Say they are in McKinley, TX which I have not been able to confirm. I do not believe that microsoft offers a service such as this anyway.
This is a scam. They are not from Microsoft Tech Support. They may try to get you to go to ammyy.com which will allow to to control your computer when you run the program.