Windows 10 Fall Creator's Update failing with 0xc1420121

Originally a Win7 machine, successfully upgraded to Win10 during the free upgrade period.

According to the update history it appears to have been struggling to install updates since 1703

Have tried clean boot - no change

Have run the troubleshooter (wu170509.diagcab) which always reports finding database corruption and claims to fix it, but on re-running it still reports the same problem.

Have tried using the MediaCreationTool to do an in-place upgrade, but this always fails (no useful error message)

System drive C: has 118GB used, 334GB free

System Reserved partition has 34.5MB in use, 65.4MB free

Is there anything left to try before giving up and doing a complete re-install of Windows, with all the disruption that entails?

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Check your make and model and go to the following link to see if creators update is supported.
https://answers.microsoft.com/en-us/windows/for...

If it is not supported then block creators by doing the following.
Go to search and type Task Scheduler and open it
click Task Scheduler Library>Microsoft>Windows>UpdateOrchestrator. Once you click on "UpdateOrchestrator", you will see a list become populated in the center upper portion of the window.
DISABLE "UpdateAssistant" and "UpdateAssistantCalendarRun".

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Do you have the error code when you run Media creation tool?
https://support.microsoft.com/en-us/help/10587/...
Sumit
Volunteer Moderator- Microsoft Community

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Hi Christopher. I'm Greg, an installation specialist and 8 year Windows MVP, here to help you.

There is a new guided walk-through from Microsoft for repairing Windows Update that leads up to resetting components if necessary: https://support.microsoft.com/en-us/help/10164/.... Try running that first.

Try the steps here for Overcoming Version Upgrade problems: http://answers.microsoft.com/en-us/windows/wiki...

If these fail then follow the illustrated steps in this link which compile the best possible Clean Install of Windows which will stay that way as long as you stick with the tools and methods given, has zero reported problems, and is better than any amount of money could buy: http://answers.microsoft.com/en-us/windows/wiki...

Make sure during the booted install to follow the illustrated steps to delete all partitions down to Unallocated Space to get it cleanest, then click Next to let it auto-create the needed partitions, format them and begin install - this makes it foolproof.


There is also an automated Fresh Start that reinstalls WIndows while shedding corrupting factory bloatware, saves your files, but doesn't clear the drive to get it cleanest: https://www.howtogeek.com/265054/how-to-easily-...

I hope this helps. Feel free to ask back any questions and let us know how it goes. I will keep working with you until it's resolved.
_________________

Windows MVP 2010-20

Millions helped via my tutorials and personally in forums for 12 years. Now an Independent Advisor.

I do not quit for those who are polite and cooperative.

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1. Type "Task Scheduler" in the search bar next to the windows icon in the lower left corner. A window will pop up.



2. On the left hand side, click Task Scheduler Library>Microsoft>Windows>UpdateOrchestrator. Once you click on "UpdateOrchestrator", you will see a list become populated in the center upper portion of the window.

3. What you want to do at this point is DISABLE "UpdateAssistant" and "UpdateAssistantCalendarRun". Voila. Windows 10 Update Assistant will be dead forever and you are free to use your perfectly working as-is PC indefinitely without interruptions.




Source: https://answers.microsoft.com/en-us/windows/for...

Please be advised some users are reporting issues with the Windows 10 1709 update. Make sure you backup before attempting to upgrade:

http://answers.microsoft.com/en-us/windows/wiki...

How to block it if you don't want to upgrade:
https://www.groovypost.com/howto/block-windows-...

What is the make and model of your computer?

Have you checked the manufacturers website to determine compatibility?
Check this List to Determine if Your Computer is Compatible with homegrouthe Windows 10 Fall Creators Update 1709
https://answers.microsoft.com/en-us/windows/wik...

perform the following tasks:
12 Things You Should Do Before Installing Windows 10 Creators Update (Version 1709)
https://www.groovypost.com/howto/prepare-comput...


How to download official Windows 10 ISO files
http://answers.microsoft.com/en-us/windows/wiki...

How to Upgrade to Windows 10 Creators Update version 1709 using ISO File from Versions 1507, 1511, 1607 and 1703
https://answers.microsoft.com/en-us/windows/wik...
Best,
Andre
Windows Insider MVP
MVP-Windows and Devices for IT
twitter/adacosta
groovypost.com

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Last updated March 12, 2021 Views 3,251 Applies to: