It saddens mw but it has to be said again and again:
Microsoft WILL NOT CALL you because your computer "has been reported" or anything similar.Please take the few minutes to read this article from the How-To-Geek on common scamming tricks and what to do about them. This article talks about some other commonly encountered scams as well, not only the Microsoft or Tech Support based scams.
It always is good to be well informed. The time to read the HTG article is time well spent; it can help you to avoid the most common traps.