Fix Update KB5066835/KB5066128 Not Installing Install Error 0x800f0991 On Windows 11 @AaronTechSol

Updated September 2026, 1 week ago

Fix Update KB5066835/KB5066128 Not Installing Install Error 0x800f0991 On Windows 11

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$Windows 11 25H2:Fix Taskbar Clock & System Tray Icons Disappeared/Start Menu Not Working/Not Showing How To Fix Taskbar Clock & System Tray Icons Disappear/Start Menu Not Working/Not Showing In Windows 11 Version 25H2 Windows + I Step 1) Restart Windows Explorer Ctrl + Shift + Esc Update Windows 11 Windows + I Step 2) Run DISM and SFC command: Ctrl + Shift + Esc sfc /scannow DISM.exe /Online /Cleanup-image /Restorehealth CTRL +ALT +DEL and restart PC from lock screen Step 3) Press Ctrl + Shift + Esc Type powershell Get-AppXPackage -AllUsers | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register $($_.InstallLocation)AppXManifest.xml} Get-AppxPackage Microsoft.Windows.ShellExperienceHost | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register $($_.InstallLocation)AppXManifest.xml} Step 4) Use Fix Problems Using Windows Update Step 5) Update Windows 11 Using Media Creation Tool Windows + R microsoft-edge: https://www.microsoft.com/en-us/software-download/windows11$

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Fix Update KB5066835/KB5066128 Not Installing Install Error 0x800f0991 On Windows 11