Fix – Windows 10 Defender Threat Service has stopped error

    Windows 10 Defender threat service showing error message instead of working properly? Fret not! The blog post quick workaround to fix the issue.


    Some users reporting on the Microsoft Forums and other sites that on ‘Virus and threat protection’ a notification appear with an error message which reads:

    The threat service has stopped. Restart it now.

    After that, if you try to click on the Restart button, then another dialog with error message appear that reads:

    Unexpected error. Sorry, we ran into a problem. Please try again.

    Affected users also reporting that they start seeing this error message after installing Windows 10 KB4549951 for Windows Defender which was rolled out by the Microsoft via Windows Updates.

    The following Windows 10 Defender bug prevents using from performing scans which make expose users to various bugs and security risks. Apart from this, Windows Defender is crashing or freezing while performing full and quick scans.

    Fix – Windows 10 Defender Threat Service has stopped error

    In upcoming we will share with you two possible ways which might help you in fixing the issue. Let’s start with first one:

    Check for Update

    Head over to Settings > Update & Security > Windows Security > Virus and threat protection. Here on the right side, head over to the “Virus and threat protection update” section.

    Virus and threat protection updated in windows 10 defender

    Here, click on the check for update. If any update is available. Install the update and reboot your system.

    Even Viewer Method

    Launch Event view in Windows 10. You can search it using Start menu search and when it appears, click to open it.

    Next, head over to Applications and Services logs > Microsoft > Windows > Windows Defender > Operational.

    "crash exception code 0xc00000005" code in event viewer in windows 10

    Here, you will find an error message and code which reads “crash exception code 0xc00000005” with file name with two dots. Either remove extra dots or delete the same file.

    After doing this reboot your computer and then launch Windows Defender and perform the scan.

    DisableAntiSpyware Registry

    If above method fails to fix the issue, then you can use the following registry hack:

    In Start menu search type, regedit and when it appear in results, click open it.

    Head over to follow key location: Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender

    On the right-side, right-click and select DWORD 32-bit Value and name it DisableAntiSpyware.

    DisableAntiSpyware Registry in windows 10

    Double-click on it and set its Value data to 0.

    Close everything and reboot your computer.

    Is Windows 10 Defender also showing you the same error message? The solution mentioned in this post help in fixing the issue? Let us know in the comments.

    Viney Dhiman
    Himachali, Mechanical Engineer, Snooker Lover, Avid drinker of Scotch, Traveler, and Webmaster. (

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