They called me too.  They said they were from microsoft, and I questioned their integrity.  I decided to play along for awhile.  They convinced me to let them remotely control my computer.  But before that, they didn't even know what kind of computer I had.  I thought that was odd enough, but I played along as they tried to convince me that an error report was viruses on my computer and they were surprised my computer still worked.  They tried to delete permanent files on my computer and the computers safeties came on, and then they deleted some log entries saying it was viruses.  They said they could not fully delete the viruses without taking my computer back to it's original state and making me pay $199.00 for protection and registry repair programing.  I immediately disconnected their remote access and removed the program from my computer after telling them I did not trust them and hanging up on them.  Microsoft does not have to call you to repair your computer unless you have requested it.  They will never call you on their own.  So know it is a scam if someone should call with these claims.