KB5067036/KB5067931 Update Not Installing Install Error 0x800f0991 On Windows 11 FIX
When you see Error 0x800f0991 during installation of updates KB5067036 or KB5067931 on Windows 11, it means that Windows cannot complete the update process because key update infrastructure is broken — often due to corrupted servicing files, cached data problems, missing dependencies or interference from software/settings.Here are the key conditions that lead to this error:
Corrupted Windows component store or servicing files: The WinSxS folder (which holds system files and manifests needed to process updates) may be damaged or out of sync. When this happens, updates like KB5067036/KB5067931 fail with 0x800f0991.
Missing or damaged system files or dependencies: If files required by the update are missing, corrupted or not accessible (often due to previous failed updates or system interruptions), the installation can fail.
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Corrupted update cache or temporary files: Folders such as C:\Windows\SoftwareDistribution or C:\Windows\System32\Catroot2 may contain incomplete, corrupted or locked files. These impair the update process.
Conflicts with optional features, language packs or system configuration: Additional installed language packs, regional components or extra features that don’t match the update’s expectations can cause 0x800f0991.
Third-party software interference or update services not working: Antivirus programs, system optimizers, or disabled Windows Update services can block the update installation.
Chapters:
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