Fix Windows Defender Update Fails 0x800106ba Error

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When installing updates for their computers via Windows Update, many users reported a single update – a definition update for Windows Defender – as a failure, with error code 800106ba associated with the problem. Windows Defender definition updates contain new and updated definitions for all known viruses and malware. These updates are therefore absolutely essential to the optimal functioning of Windows Defender, and why not be able to install only one of these updates can be a fairly significant problem.

Other users also reported that not only did Windows Defender updates fail, but many other upcoming updates for Microsoft Office, Windows Live Essentials, Skype, Microsoft Silverlight, etc. also failed. Although this problem is common among Windows 10 users, it has also been reported on previous operating systems, including Windows Vista.

In most cases, the problem is due to the conflict with security software, for example Avast, Norton, Malwarebytes, etc. So if you get the error 0x800106ba, we strongly recommend that you stop or delete the third-party antivirus completely. However, if you are not using other antivirus or antimalware programs, the error may have been caused by a recently installed Windows Defender update, but the Windows Defender firewall remains obsolete. This can happen if the PC user does not have the required permissions for the update, or if some update files are missing or corrupted. Fortunately, there are some methods you can try to fix the Windows Defender 0x800106ba error.

To fix the update error in the Windows Defender definition 800106ba:

Installing the Windows Defender update

To solve this problem and successfully download the failed definition update, you must:

1. Open the Start menu.
2. Click on Settings.
3. Click on Update and Security.
4. In the left pane, click on Windows Defender.
5. In the right pane, scroll down to the Version Information section and click Open Windows Defender to launch the Windows Defender Desktop application.
6. Navigate to the update in the Windows Defender application.
7. Click on Update.

Set Windows Defender to automatic

If your Windows Defender is set to Off or Manual, try setting it to Automatic. To do this, you must do it:

1. Click on the Windows button, type Services, then select Services from the list.
2. Locate Windows Defender and double-click on it.
3. Select the start type and set it to Automatic.
4. Click OK to save the changes.

Use the command prompt

Some commands that you can execute from an administrator prompt can help you solve this problem.

Press the Windows key, right-click the result and select Run as administrator. Or press the Windows and X keys on your keyboard simultaneously and select Command prompt (Admin) from the menu.
At the administrator’s command prompt, type the following commands, then press Enter after each command to execute them. Be sure to wait until the message of the first command is finished before writing and executing the second command. Also make sure that you do not make typos with the controls.

“%PROGRAMFILES%\Windows Defender\MPCMDRUN.exe” -RemoveDefinitions -All

“%PROGRAMFILES%\Windows Defender\MPCMDRUN.exe” -SignatureUpdate

After both commands have been executed, you can close the command prompt.

Try to run updates now; you should be able to do so from Windows Update and Windows Defender.
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