I am unable to install Windows 2026-02 Security Update

Question

I am unable to install Windows 2026-02 Security Update. I have not had a problem with updates in the past. I have tried a few fixes from other posts, but none of them have resolved the problem.

Answer 1

Hello Scott Maurice!

Welcome to Microsoft Q&A forum.

I see you’re having trouble with installing the Windows 2026-02 Security Update. To help resolve this issue, here are several steps you can try:

1. Basic checks

• Make sure you have at least 10–15 GB free on the system drive (usually C:)
• Temporarily disable third‑party antivirus or firewall (not Windows Defender).
• Reboot once, then try Retry all again.

2. Run Windows Update troubleshooter

• Press Win + I > System > Troubleshoot > Other troubleshooters.
• Run Windows Update troubleshooter and apply all fixes it suggests.
• Reboot and try the update again.

3. Clear Windows Update cache

Open Command Prompt (Admin) and run these commands one by one:

net stop wuauserv

net stop bits

net stop cryptsvc

ren %systemroot%\SoftwareDistribution SoftwareDistribution.old

ren %systemroot%\System32\catroot2 catroot2.old

net start wuauserv

net start bits

net start cryptsvc

Then retry the update.

4. Run DISM and SFC

In a Terminal/Command Prompt, run (as administrator):

DISM /Online /Cleanup-Image /StartComponentCleanup

DISM /Online /Cleanup-Image /RestoreHealth

sfc /scannow

Wait for both to finish, reboot, and try the update again.

5. Download and install the update manually (recommend)

• Open Settings > Update & Security > Windows Update > View update history and note the KB number of the update.
• Go to the Microsoft Update Catalog
• Search for the KB number, then download the version that matches your system (e.g., Windows 11 23H2 x64).
• Double‑click the downloaded .msu file and follow the prompts, then restart.

Hopefully, this will help you get that update installed. Let me know how it goes so we can decide the next step if needed.

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Answer 2

Hi. I'm David, and I'm happy to help you.

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Please clarify the following:

Are you getting an error code? If yes, which one?

If you don't get an error code, see the update history.

• Press "Windows + I" and select "Windows Update > Update history".

If you prefer, share a screenshot. Use the shortcut "Windows + Shift + S" to use the screenshot tool.

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Also. What is the current "OS Build" of your Windows 11?

• Press "Windows + R", type winver, and click OK.

If you prefer, share a screenshot.

Be sure to censor your email address if it appears. The Microsoft Q&A is public.

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I await your reply.

Answer 3

If you're unable to install the Windows 2026-02 Security Update, there are several common issues and solutions you can try:

1. Check for Superseded Updates: Ensure that the update you are trying to install has not been superseded by a newer update. You can check the Microsoft Update Catalog for any newer updates that may have replaced it.
2. Verify Installation: Confirm that the update is not already installed on your system. You can do this by checking the update history in Windows Update settings.
3. Architecture Compatibility: Make sure that the update is appropriate for your system's architecture (e.g., x86 vs. x64) and that it matches your Windows version. For example, updates for Windows Server cannot be installed on Windows client versions.
4. Prerequisite Updates: Check if any prerequisite updates need to be installed before you can install the security update. You can find this information in the update's related article.
5. Repair the Component Store: If you continue to have issues, you can try repairing the component store using the DISM tool. Open an elevated command prompt and run the following commands:

      DISM /ONLINE /CLEANUP-IMAGE /SCANHEALTH
      DISM /ONLINE /CLEANUP-IMAGE /CHECKHEALTH
      DISM /ONLINE /CLEANUP-IMAGE /RESTOREHEALTH
      sfc /scannow
   

   After running these commands, restart your device and try the update again.

If these steps do not resolve the issue, you may want to check the CBS logs for more specific error messages that could give further insight into the problem.

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References:

• Common issues and solutions
• Troubleshoot Windows Update error code 0x800f0823
• Error 0x800f0831 when you install an update
• Troubleshoot Windows Update error 0x80070002
• Error 0x800f0922 caused by corrupted scheduled task when installing Windows updates