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The Windows 11 Update KB5058499 not installing with error code 0x800f0991 typically points to a problem with Windows servicing, component store corruption, or failed prerequisites. Here’s a breakdown of the most common causes:

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1. Corrupted Windows Component Store (WinSxS)
• The WinSxS folder contains essential update files. If it becomes corrupted, updates like KB5058499 may fail with error 0x800f0991.

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2. Missing or Failed Servicing Stack Update (SSU)
• KB5058499 might depend on a Servicing Stack Update that hasn’t been installed yet. If the SSU is missing or damaged, the update can’t proceed.

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3. Failed Previous Update Attempts
• If earlier updates failed or were partially installed, leftover files or registry entries can conflict with KB5058499.

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4. Third-Party Software Interference
• Overprotective antivirus or system optimization tools can block the update process or corrupt essential update files during download or installation.

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5. Outdated or Incompatible Drivers
• Hardware drivers, especially those for chipsets or storage, can cause conflicts during update installation, especially if they are outdated or not WHQL-certified.

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》 CHAPTERS 《

00:00 Intro
00:22 Solution #1
00:58 Solution #2
01:56 Solution #3
03:02 Solution #4
04:09 Solution #5
05:05 Solution #6
08:09 Outro