Need a fix for Windows 11 26220.7752 error message

The error code 0x800f0991 typically indicates that there are issues with the Windows Update components or that certain files required for the update are missing or corrupted. Here are some steps you can try to resolve this issue:

1. Run the Windows Update Troubleshooter:
   • Go to Settings > Update & Security > Troubleshoot > Additional troubleshooters > Windows Update and run the troubleshooter.
2. Check for System File Corruption:
   • Open Command Prompt as an administrator and run the command: sfc /scannow. This will scan for and attempt to repair any corrupted system files.
3. Use the DISM Tool:
   • In the Command Prompt, run the following commands one by one:
     • DISM /Online /Cleanup-Image /CheckHealth
     • DISM /Online /Cleanup-Image /ScanHealth
     • DISM /Online /Cleanup-Image /RestoreHealth
4. Reset Windows Update Components:
   • You can manually reset the Windows Update components by stopping the Windows Update service, renaming the SoftwareDistribution and Catroot2 folders, and then restarting the service. This can sometimes resolve update issues.
5. Perform an In-place Upgrade:
   • If the above methods do not work, consider performing an in-place upgrade using an ISO file for Windows 11. This will allow you to reinstall Windows while keeping your files and applications intact.

If the issue persists, you may want to check the Microsoft Support Community for more specific guidance related to your error code.

References:

• Resolved issues in Windows 11, version 25H2
• Windows 11, version 23H2 known issues and notifications

realice una reinstalación del sistema con la misma iso que había utilizado desde el principio

No hay buen resultado, sigo con ese problema que no se instala en Windows 11 Insider Preview Quality Update (26220.7752)

Hello Guido Pozo, welcome to Microsoft Q&A forum.

The Q&A Assist already listed the common Windows Update checks. To add a bit more detail on step 4 (Reset Windows Update Components), here are the exact commands you can run in an elevated Command Prompt:

net stop wuauserv

net stop cryptSvc

net stop bits

net stop msiserver

ren C:\Windows\SoftwareDistribution SoftwareDistribution.old

ren C:\Windows\System32\catroot2 catroot2.old

net start wuauserv

net start cryptSvc

net start bits

net start msiserver

After that, restart and try the update again.

Also, since this is an Insider Preview build, update failures like this are not uncommon and are often resolved by Microsoft in a subsequent flight. No action needed on your end in many cases.