I just started an identical thread when I received the same error.  Then I googled the error and received a list of responses that indicate it's due to a missing file or erroneous configuration with the operating system.  It could have been caused by an inadvertent manual deletion on the part of the user, or from a de-installation of another piece of software.  The fixes entail either taking the PC to a technical specialist for update, or downloading PC repair software from the web (for a charge, of course).  There is a trust issue with that last option, at least for me.