Some update files aren't signed correctly. Error code: (0x800b0109)

Question

my Microsoft store failed to initialize & also window update not working(Some update files aren't signed correctly. Error code: (0x800b0109))....

Answer 1

Thanks for the clarification.

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Many factors can cause this error. To avoid a long answer, I will suggest a few procedures. If these do not work, there are other methods.

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To begin, temporarily disable all antivirus modules and attempt to perform the update. Refer to the support or help documentation provided by the antivirus developer for guidance on how to disable modules. Regardless of the outcome, remember to re-enable the antivirus modules after completing the process.

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If the same error occurs with the antivirus modules disabled, I suggest doing the following:

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Run the Windows Update troubleshooter and try to install the update.

https://support.microsoft.com/en-us/windows/windows-update-troubleshooter-19bc41ca-ad72-ae67-af3c-89ce169755dd#WindowsVersion=Windows_11

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If it persists, rename the software distribution folders as instructed below:

1. Open Start and type cmd, right-click on "Command Prompt", and select "Run as administrator".
2. Run the following commands at the Command Prompt one at a time:

net stop bits
net stop wuauserv
net stop cryptsvc
ren %systemroot%\softwaredistribution softwaredistribution.bak
ren %systemroot%\system32\catroot2 catroot2.bak
net start bits
net start wuauserv
net start cryptsvc

3. After all these commands are completed, close the Command Prompt window, restart your computer, and then try to update Windows.

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If it persists, use the system file checker to repair possible corrupted or missing system files.

1. Open Start and type cmd, right-click on "Command Prompt", and select "Run as administrator".
2. Run the following commands at the Command Prompt one at a time:

dism.exe /online /cleanup-image /scanhealth
dism.exe /online /cleanup-image /restorehealth
dism.exe /online /cleanup-image /startcomponentcleanup
sfc /scannow

Note: Pay close attention to the results of the commands. This will help you determine whether the procedure was completed successfully or if there was a problem. If you get any errors, let me know the error message that was displayed.

3. Then restart your PC and see if you can update.

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If the problem persists, please let me know, and I will provide another method.

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Feel free to ask back any questions.

Answer 2

YES I USE QUICK HEAL SECURITY
I WILL USE WINDOW 11 VERSION 25H2 (OS BUILD 26200.7462)

Answer 3

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

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Problems with the Microsoft Store and Windows Update are usually linked. Solving one solves the other, so I suggest we focus on Windows Update.

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Please clarify the following:

Do you have a third-party antivirus installed? If yes, which one?

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

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

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

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

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I await your reply.