Install error - 0x800f0900

Question

How to fix 2026-06 Security Update (KB5094126) (26200.8655 Install error - 0x800f0900

Answer 1

Hi,

0x800f0900 denotes component store corruption, and DISM may not be able to fix it.

The following repair installation procedure should fix most of the Windows Update errors.

Fix issues by reinstalling the current version of Windows - Microsoft Support

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Answer 2

Error 0x800f0900 is a generic Windows Update servicing error. From the available information, only general Windows Update repair steps are covered.

To try to fix the install error for KB5094126 (26200.8655):

1. Run a component cleanup
   1. Open Start, type cmd.
   2. Right‑click Command Prompt and select Run as administrator.
   3. If prompted by User Account Control, select Yes.
   4. Run this command:

            dism /online /cleanup-image /startcomponentcleanup
      

   5. Wait for the command to complete.
   6. Restart the device.
   7. Go to Settings > Windows Update and try installing updates again.
2. If the update still fails, manually install the latest cumulative update for Windows 11 that corresponds to the device’s version, using the appropriate update history page for Windows 11 and then the Microsoft Update Catalog, as described in the Windows Update error 0x800f0823 guidance:
   1. Identify the correct Windows 11 version.
   2. From the Windows 11 update history page, note the KB number of the latest cumulative update.
   3. Search that KB number in the Microsoft Update Catalog.
   4. Download the package that matches the system architecture and install it.
   5. Restart and then try Windows Update again.
3. If issues persist after these steps, collect logs (such as CBS.log) and contact Microsoft Support for further assistance, as recommended for persistent Windows Update errors.

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References:

• Troubleshoot Windows Update error code 0x800f0823
• When trying to install updates from Windows Update you might receive "Updates Failed. There were problems installing some updates, but we'll try again later" with Errors: 0x80073701, 0x800f0988
• Contacting Microsoft Support With an Update Related Question (KB5071959) - Microsoft Q&A