Someone at a so-called "Microsoft Service Center" called to say that my computer was being hacked.  To prove it, they had me use a viewer to look at an event log.  The warnings and errors that show up seem to be normal.  Also, since I seriously doubt that my computer is uploading my event logs to another site, there's no way for anyone else to know about *MY* computer unless they are discussing events that everybody has or events that are not really a problem.  (Just because something is called an "error", doesn't mean that it isn't expected or that it is abnormal, especially when talking about network events.)

This is a very big con going on right now. Don't ever allow your computer to be looked at remotely.

Just received a call from this #.  Pressed "talk" and "talk" again to disconnect.  Hopefully they will think it was a block.  CID just listed as "unknown name".