Repeated updates failure

[theta30]

1) History: the following update failed KB2817493 until November 13. I see on November 13 has been an installation-Microsoft Office 365 Home Premium , on November 14 some Windows 7 and Office successful updates. KB2817493 update stopped.
After this, however I get updates failure every time I shutdown. The updates are KB2817314, KB2827239, KB2817316, all 64-bit edition.
These have Error Details:code 51E for first two and code 517 for the third one.

2) This might be related to other problem. When I click on Excel or Powerpoint files I am prompted to Instal Microsoft Office Professional Plus 2013 and I get the "error 1310: Error writing to file:C\Program Files\Microsoft Office\Office 15\ADDINS\PowerPivotExcelAdd-in\Resources\1025\PowerPivotExcelClientAddIn.rll Verify that you have access to that directory"
I verify and I am told that "You gave been denied permission to access this folder". In the security tab I am told that "Corrent Owner: Unable to display current owner"
I however been able (most of the time) to open Word files and also can access the Excel, Powerpoint files by opening first main Excel, Powerpoint, then opening the specific files.






I don't know either the second problem is related to the first one. Please then concentrate on answering the first issue (the one with the updates). Please tell me how to solve the problem with the updates. If you can tell me what is with the second problem, that would be of course better.