I had recently disabled windows defender on windows 10 and when I did I know want to enable it again but when I open action center and press Turn On Now it does nothing. I have pressed it multiple times and with no result. Fix: press Windows Key + R type regedit locate the following path * HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\WINDOWS DEFENDER* Right Click this file and select permissions press Advanced where it says owner press change change the owner to your username Now press apply then ok select Full Control from the permissions menu (click the Widnows Defender folder ) Find the value DisableAntiSpyware and DisableAntiVirus and set these values to 0 (explaination: double click each and where the 1 is put 0 and press ok) Open services.msc find Windows Defender there should be 2 services: Windows Defender Service and Windows Defnder Netwrok right click each and press start after you have started both restart your computer Run Windows Defend er I Hope this Helps! Feel Free to Reply

Fix: press Windows Key + R type regedit locate the following path * HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\WINDOWS DEFENDER* Right Click this file and select permissions press Advanced where it says owner press change change the owner to your username Now press apply then ok select Full Control from the permissions menu (click the Widnows Defender folder ) Find the value DisableAntiSpyware and DisableAntiVirus and set these values to 0 (explaination: double click each and where the 1 is put 0 and press ok) Open services.msc find Windows Defender there should be 2 services: Windows Defender Service and Windows Defnder Netwrok right click each and press start after you have started both restart your computer Run Windows Defend er I Hope this Helps! Feel Free to Reply

Hi, Thank you for contacting Microsoft Community. The other thread posted by you regarding the same issue has been answered. Please refer to the link below and follow the suggestions by Winston M replied on November 22, 2014 and post the query in TechNet Forums. https://answers.microsoft.com/en-us/windows/forum/windows_tp-security/windows-10-windows-defender-will-not-turn-on/7a4b5d48-03c7-4a11-a17a-6689457715e6 Let us know if you face any issues with Windows.

Hi, Thank you for replying. Since you have tried on multiple computers, I would recommend posting your query in the TechNet Forums. https://social.technet.microsoft.com/Forums/en-US/home?category=WinPreview2014 Hope this information helps.

Hi, I have tried the Clean boot before and to no avail. I believe this problem comes from Windows 10 technical Build its self It would be helpful if you could inform and or fix this issue for a windows update I have now tried this on 13 Computers running from build 9860 to 9879 The problem is there in these builds. I have checked the registry and the values: DisableAntiSpyware is set to 1 DisableAntiVirus is set to 1 When you try to set the value to 0 it says there was an error writing value's new content which I believe to be the source of the issue. Thank You, Please Reply

Windows 10: Windows Defender will not turn on SOLVED

Anonymous

I had recently disabled windows defender on windows 10 and when I did I know want to enable it again but when I open action center and press Turn On Now it does nothing. I have pressed it multiple times and with no result.

Fix:

press Windows Key + R
type regedit
locate the following path *HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\WINDOWS DEFENDER*
Right Click this file and select permissions
press Advanced
where it says owner press change
change the owner to your username
Now press applythen ok
select Full Controlfrom the permissions menu

(click the Widnows Defender folder)

Find the value DisableAntiSpyware and DisableAntiVirus and set these values to 0

(explaination: double click each and where the 1 is put 0 and press ok)

Open services.msc
find Windows Defender
there should be 2 services: Windows Defender Serviceand Windows Defnder Netwrok
right click each and press start
after you have started both restart your computer
Run Windows Defend er

I Hope this Helps!

Feel Free to Reply

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Answer accepted by question author