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Windows error 0x800B0109 “Some update files are not signed correctly”

by | Feb 1, 2021

At times, while trying to update any file using Windows Update, you may come across a Windows error 0x800B0109 “Some update files are not signed correctly” that might be annoying.

Usually, this happens when Windows continuously fail to search for an update or cannot install the updates.

Now, the question arises ‘How to fix this Windows Update error?’. Today we’ll see how our Experts fix this error for our customers.

Here at Bobcares, we have seen several such Windows-related errors as part of our Server Management Services for web hosts and online service providers.


What causes windows update error 0x800B0109 to occur

Sometimes, when a Windows update is trying to install an update it may throw an error message 0x800B0109. This happens if the file that Windows is trying to update is either damaged or missing. This happens in most cases, be it a security update or a cumulative update.

There can be many reasons for this error to occur, that include Windows Registry, Windows Filesystem, internet access, Windows Update service, file corruption, misconfiguration, Adware, virus, and Malware

In almost all cases, no matter how many times we restart the computer, the update will continue to fail constantly and we will not be able to update it no matter what.


How we fix the Windows error 0x800B0109 “Some update files are not signed correctly”

Now let’s take a look at how our Support Engineers resolve this error message to our customers.


Method 1: Clean the Windows Update temporary cache folder

Step 1: Stop Windows Update service

  • First, in the Run prompt, we type “services.msc”.
  • A new window will open containing all Windows services on the system.
  • Here, we search for “Windows Update”.
  • Then we right-click on the “Windows Update” and then click Stop.

Step 2: Clean the Windows Update temporary cache folder

  • Now, we type %windir%\SoftwareDistribution\DataStore in the Run prompt and click OK.
  • As a result, it will open Windows Explorer in the correct location.
  • Then we delete all contents of this folder.

Step 3: Start Windows Update service

  • We type “services.msc” in the Run prompt.
  • A new window will open containing all Windows services on the system.
  • Here, we search for “Windows Update”.
  • Finally we right-click on the “Windows Update” and then click Start.


Method 2: Run SFC utility to fix 0x800B0109 error

We run the System File Checker (SFC) utility if the problem still persists.

  • First, we click Start type “cmd”.
  • In the search results, cmd will show up with a black icon.
  • Now, we right-click on it and select Run as administrator.
  • If prompted for the admin password, we enter the password and click OK.
  • A new completely black window will open where we type sfc/scannow and press Enter.
  • This process will take a long time. Once the SFC process finishes, we restart the computer. After the restart, we search for Updates again.


Method 3: Clean Windows Update download path

The Registry Editor is a very powerful tool. We suggest taking a backup before modifying anything, as it may cause problems, and we want to have a safe solution. After opening it, we just click File on the top left corner and choose Export. Then we set the settings and save a backup of the registry.

  • First, we type “regedit” in the Run prompt and press Enter
  • Next, we expand HKLM, then Software, Policies, Microsoft, Windows, and finally Windows Update.
  • After finding it, we search for WUServer and WIStatusServer in the right-hand pane.
  • If they are not listed, we cannot clean the download path. Otherwise, we delete both.
  • Finally, we restart the server.


Method 4: Run the Windows Update troubleshooter to fix 0x800B0109 error

This issue with Windows Update can be solved by running the Windows Update troubleshooter.

For that, we run Windows Update troubleshooter from Control Panel >> Troubleshooting >> View all and we select Windows Update and follow the on-screen instructions.

[Need any further assistance in fixing Windows errors? – We are here to help you]



Today, we saw how our Support Engineers fix the windows update error 0x800B0109


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