Windows 10: Windows 11 25217.1010 ucrtbase.dll 0xc0000409

: explorer.exe: 10.0.25217.1010: 0x537307d6: ucrtbase.dll: 10.0.25217.1000: 0xeaa4b4fe: 0xc0000409: 0x000000000005ddee ID: 0x0x31D4: 0x0x1D8DDE983F8E7E8: C:\WINDOWS\explorer.exe: C:\WINDOWS\System32\ucrtbase.dll ID: 27a605f5-1c34-4c2f-a256-c7a6a3699a29: ID:

:)

 

windows 11 setup fails error 0xc0000409

Hi

As noted in the subject, I am getting error 0xc0000409 when attempting to upgrade to Windows 11.

I have already tried various suggestions including checkdisk, sfc, clean boot (disable all non microsoft services), etc.

Thank you

 

Win11 upgrade fails at 82% with error 0xc0000409

Windows 10 many security features that can be enabled to make experience almost comparable, in some instances, to Windows 11.

I recommend staying at Windows 10 for a bit longer (until end of Q1 or Q2 of 22), or backing up all data and preforming a fresh clean install of Windows 11. (Clean installs almost always have less issues than in place upgrades, assuming no driver issues.)

What is the make and model of your computer?

With this information we can look up specific information from the vendor's website.

Related KBs:

• Redirecting
  
  • Outcome, clean install
    
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  • Latest recommended action, disable all AV during install (but your post indicated this step was done)
    
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  • What does the PC Health Check App say?
    
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  • May need to reset Windows Update components and have av disabled on next attempt
    

 

DLL Missing

The problem is, that the required DLL is not actually even listed there.
There are just dozens of download adware links from the top to the bottom.