Windows Defender in Windows 8.1 Will Not Turn On

Anonymous
2013-11-24T01:31:23+00:00

I recently updated Windows 8 to Windows 8.1.  Windows Defender had been on in Windows 8 and even after the update to 8.1.  I turned it off momentarily but have been unable to turn it back on.  To my knowledge, I have no other anti-virus programs running.  How can I turn it back on?

Windows for home | Previous Windows versions | Security and privacy

Locked Question. This question was migrated from the Microsoft Support Community. You can vote on whether it's helpful, but you can't add comments or replies or follow the question.

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  1. Anonymous
    2015-05-15T18:34:26+00:00

    Get Services error on Method 1:

    Windows could not start the Windows Defender Service on Local Computer.

    Error 577: Windows cannot verify the digital signature for this file.  A recent hardware or software change might have installed a file that is signed incorrectly or damaged, or that might be malicious software from an unknown source.

    How do I obtain the correct software?

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  2. Anonymous
    2015-05-15T20:08:26+00:00

    TIP: Always state your Internet Explorer version (e.g., IE7; IE8; IE9; IE10; IE11) as well as your full Windows version (e.g., Vista 32-bit SP1; Vista 64-bit SP2; Win7 32-bit; Win7 64-bit SP1; Win8 32-bit; Win8.1 64-bit; Win RT 8.1; Win8.1 64-bit; Surface Pro; Surface 2; Surface Pro 3; Win10TP) when posting in a forum.

    See...

        • HOW TO begin your own, new thread about your computer & problem

           http://answers.microsoft.com/en-us/page/faq#faqAskQuestion1

        • Suggestions for asking a question in help forums

           http://support.microsoft.com/kb/555375

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  3. Anonymous
    2015-05-23T20:55:34+00:00

    I have tried to click the start button when opening windows defender service as it said to do, but I cannot click on it, or any buttons next to it

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  4. Anonymous
    2015-06-02T20:28:55+00:00

    Nothing seems to turn it on... Need help, I should be able to get this Windows Defender App back some how, but nothing seems to work.

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  5. Anonymous
    2015-06-02T20:31:09+00:00

    nothing works for me either.. tried every way that I no i'm theresn a way to get it back!

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