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#21
Another potential cause of this problem: reagentc /enable failing with error code 3bc3, Windows Update failing with error 800F0922 - Super User
If you ever had some problem with the EFI partition, this will likely work for you.
In summary, you should check the ID of the EFI partition, and if it'sebd0a0a2-b9e5-4433-87c0-68b6b72699c7
, you should set it toc12a7328-f81f-11d2-ba4b-00a0c93ec93b
. Doing so fixed a lot of weird problems in my system.