On a regular Windows Update routine I'm getting the following message:
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]
Checking the event viewer, I see 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).
I've got the same issue and following on @Arthur's suggestion, I had a look at my user SIDs in the registry 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 the registry before trying that.
Fix for Windows 10
I had to do the same thing as above. Go into registry and remove a user called nx. It is something to do with Nvidia. I have an EVGA Geforce 960 SSC card(Nvidia). Once I removed the user called nx. Update went fine after trying for a week. Also other updates started downloading. Like they were waiting on that one.
If someone is still facing this issue here is a detailed post about all the possible fixes:
Go here for the full post which is a whopping 1732 words guide: http://troubleshooter.xyz/fix-we-couldnt-complete-the-updates-undoing-changes/
Method 1: Delete Software Distribution Folder
Browse to the C:\Windows\SoftwareDistribution folder and delete all the files and folders inside.
Again try installing the updates and this time you may be successful in installing updates.
Method 2: Download Windows Update Troubleshooter
Let Windows Update Troubleshooter run and fix issues!
I discovered that this symptom was occurring for my box with a Geforce 7600GT due to the 'nVidia Update' application that comes bundled with the older 309.08 WHQL drivers. The solution was to uninstall nVidia Update because it created a 'UpdatusUser' that was causing the problem as documented in this post.
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