Windows Defender failed to initialize

Asked By 400 points N/A Posted on -

I do not understand why this happened after I updated my version of ‘Windows Vista Home Premium’. Windows Defender ‘ was preloaded on the operating system and I could not uninstall it.

Windows Vista Home Premium. Windows Defender

Application failed to initialize: 0x800106ba. A problem caused this program’s service to stop. To start the service, restart your computer or search Help and Support for how to start a service manually.

After reinstalling my OS, the system was automatically updated to a service pack and the problem listed above happened after I updated it. Whenever ‘Windows Defender’ was opened, the error would appear immediately. The service was started before that execution, but nothing shown up on the screen. However, later a pop-up appeared. I deactivated the McAfee Antivirus but it did not help any.

I wish to know how I can manually set the update definition for Windows Defender.

Applications and software's on the SP2 are updated properly.

I also want to know that all of the applications and software's on the SP2 are updated properly.

This issue keeps occurring.

Please help.

Best Answer by Kattyrine
Best Answer
Best Answer
Answered By 0 points N/A #113361

Windows Defender failed to initialize


Hi! I'm Kattyrine,

Your problem is a common occurrence to Windows Defender when it is updated. It usually happens when you update Windows Defender and there are a number of ways you can fix the problem.

Here are two ways you can try,

  1. Uninstall Windows Defender: Go to run and type appwiz. Cpl, find Windows Defender there and uninstall it, follow the instruction during the un-installation process. Once uninstalled, you can install it again by visiting this website.
  2. Another solution would be this: Now go to start then run and type regsvr32 < filename >, replace the filename with these following file names and press Ok:











Answered By 0 points N/A #113362

Windows Defender failed to initialize



The cause of the error message is that the Windows Defender had failed to initialize with error code 0x800106ba when Windows Defender was updated. With this, we need to manually start Windows Defender to fix the problem. Here are the troubleshooting steps to follow:

  1.  Go to Start > RUN> services.msc
  2.  Look for Windows Defender and open it
  3.  Choose AUTOMATIC under the Startup Type
  4.  Click on Start under Service Status
  5.  Click on APPLY then OK

Then, restart your computer and check for any errors if any. I would also recommend that you run Windows Defender to check for unwanted and malicious files. 

Answered By 400 points N/A #113363

Windows Defender failed to initialize


Hello Experts,

Thank you for sending so much help.

I just uninstalled it from my computer even though I know it has a role in my computer system.

I will just download it when I will need it. But for now, I will just uninstall temporarily.

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