I have tried this 'FIX', it did not work.
Every time I have attempted to install Windows 8.1, the same error message appears and various programs have had to be re-installed after my computer has been returned to Windows 8.
Seems to me it is a definite fault with Microsoft's latest update and nothing at all to do with individual computers. I shall wait! for a reliable update. Microsoft have lost a vast amount of kudos through this incomprehensible error.