I have the same problem. The service Cryptographic Services and maybe others block the access.
I'd use this third party tool to unblock windows updates and it worked
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***Link Removed by Moderator***
I would like to use your solution, but apparently the "Not Invented Here" restriction applied to that third party solution. I feel sad that microsoft censored your solution.
I have had the same no updates problem for the past month and the microsoft advisors gave me all the usual template answers as seen posted elsewhere in the forums. They even had me re-download the update and reapply it while keeping previous settings, and that failed to fix the problem.