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Windows 10 windows defender problem

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#1 Antos2


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Posted 17 January 2016 - 10:46 AM

Hello everyone,


I can't turn on windows defender (error 0x80070422) so i found a solution. I should go to services-windows defender service and enable it, but when i attempt to apply my changes a message saying "access denied" pops out (i am the administrator). Is it a malware and what can i do? 


Thanks in advance!

Edited by Orange Blossom, 17 January 2016 - 11:40 AM.
Moved from Windows 10 to AII. ~ OB

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#2 Niweg


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Posted 17 January 2016 - 03:28 PM

 This certainly isn't normal.  I've been using Defender with Win 10 since the insider program began back 10/1/2014.  You could try scanning for corrupt files by opening an administrator command prompt and issuing this command: sfc /scannow.  If you think you have some kind of virus or malware, you could post in one of the security forums here.  They tend not to like discussions of that elsewhere.


 Good luck. 

Make regular full system backups or you'll be sorry sooner or later.

#3 quietman7


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Posted 17 January 2016 - 04:05 PM

What other security software are you using?


The inability to turn Windows Defender 8/10 on is typically the result of having a third-party anti-virus installed or failure to remove it properly (completely). Since Windows 8/10 Defender includes anti-virus protection, it is disabled by the installation of another anti-virus program. If a trial anti-virus (i.e. McAfee, Norton, etc) came preinstalled on your computer or you installed one, it most likely turned Windows 8 Defender off (disabled) to avoid conflicts. Windows Defender will remain disabled until that anti-virus software has been completely uninstalled. In some cases, you may need to download and run the anti-virus vendor's clean up tool to remove any remaining remnants.

After removal of the third party anti-virus, Windows 8/10 Defender needs to be activated if you choose to use it. When uninstalling the third-party anti-virus Defender should automatically turn on. In some cases you may receive a message indicating your system has no protection...click here to turn on Windows Defender. If not, and Defender remains disabled, you will need to manually turn it on.


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