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Windows Defender – Application failed to initialize: 0x800106ba

After booting up my computer, I received the following error:

Windows Defender – Application failed to initialize: 0x800106ba. A problem caused Windows Defender Service to stop. To start the service, restart your computer or search Help and Support on how to start a service manually.

Since the error says start the service manually, I went to Control Panel > Administrative Tools > Services and look for Windows Defender Service. I found it and it was Disabled. I manually enabled it and this error popped up:

Could not start the Windows Defender Service service on Local Computer. Error 0x80071b90: The system license has expired. Your logon request is denied.

So, it was already obvious. I got the first error because my system license has expired. But it was a free software, isn’t it? I digg deeper on Google and found this article. It seems that I need to download a new version of Windows Defender to be able to continue its use. It was an old error, but I noticed it only today because I’m used to putting my computer on hibernate mode. 😀

That’s all!

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Marhgil Macuha

Marhgil Macuha is a Computer Engineering graduate of Batangas State University. He is currently a Senior Solutions Developer at a Canadian IT company.

One Comment:

  1. have found this problem happens when some updates or antivirus are
    installed and is easly fixed.

    click on start
    click on control panel (must be in classic view in control panel in vista)
    double click on administrative tools
    double click on services
    scroll down and you will see windows defender under startup type this will
    proberly say manual
    right click on this and select properties
    under the general tap you will see startup type,from the drop down menu
    select automatic, click apply
    click ok, close down services and control panel by clicking on the x top
    right hand corner
    restart your computer.

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