Windows 11 Update Failed
Windows 11 Update Failed | Installation Error 0x800f081f | KB5064081 & Cumulative Update KB5065426
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If your Windows 11 update is failing with error 0x800f081f for KB5064081 or KB5065426, the first thing to do is run the Windows Update Troubleshooter. Go to Settings → System → Troubleshoot → Other troubleshooters, then click Run next to Windows Update. You should also check for corrupted system files by opening Command Prompt as admin and running these commands one by one:
DISM /Online /Cleanup-Image /CheckHealth
DISM /Online /Cleanup-Image /ScanHealth
DISM /Online /Cleanup-Image /RestoreHealth
sfc /scannow
Restart your PC and try the update again. If it still doesn’t work, you can manually download the update from the Microsoft Update Catalog
or reset the Windows Update components by stopping update services, renaming the SoftwareDistribution and Catroot2 folders, and restarting the services.
Another common cause is missing .NET Framework 3.5, which you can enable by running optionalfeatures.exe and checking the box for it. If all else fails, use the Windows 11 Installation Assistant from Microsoft’s website to repair any missing files and apply the updates. Following these steps usually fixes the 0x800f081f error without having to reinstall Windows.