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Multiple CCSv6 update errors

I have been trying for days to update my CCS installation.  The updates have failed with various error messages.  Attempts at a fresh install with latest download have failed similarly. So far, none of my error submittals have evoked a response from TI.  This is a Windows 8.1 machine which has never given me any trouble before.  The current CCS version is: 6.1.1.00022   The only change has been to change my user account from administrative to normal (for security reasons).  Has anyone else experienced these sorts of problems?