Strange Windows update issue

I'm trying to restore my missing Windows Update service. All the tutorials out there [1] [2] [3] [4] say the same thing: Get this HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\wuauserv from another computer, and paste on the damaged computer (Most of the tutorials even offer a version of the reg) Alright. It imports successfully. I navigate to this key after importing, and it's there. But it disappears after I reboot Can anyone guess why, and how to fix it ? SFC and DISM did not work. In place upgrade is not a solution: changes all my settings/personalizations and defaults. Information:

Question by Lucas BS on Super User, licensed CC BY-SA. We show a short excerpt and link to the original thread as credit.