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Windows 10: "We couldn't complete the mises à jour, undoing changers"

ayi

On a regular Windows Update routine I'm getting le message suivant:

We couldn't complete the updates, undoing changes.

The computer restarts for several more times repeating the same process, then, after system is on, checking the updates history reveals this:

Security Update for Windows 10 for x64-based Systems (KB3074683)

Failed to install on [date]

Update

Checking the event viewer, Je vois this error 4 times:

Installation Failure: Windows failed to install the following update with error 0x80070003: Security Update for Windows 10 for x64-based Systems (KB3074683).

ayi

I've got the same issue and following on @Arthur's suggestion, I had a look at my user SIDs in le registre under HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileList and some of them belonged to users that no longer existed in the system (I had previously removed them).

I've removed the dummy entries (luckily there were only a couple) and the update worked.

PLEASE save yourself some trouble and backup le registre before trying that.