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.
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Fix:
1. press Windows Key + R
2. type regedit
3. locate the following path HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\WINDOWS DEFENDER\
4. Right Click this file and select permissions
5. press Advanced
6. where it says owner press change
7. change the owner to your username
8. Now press apply then ok
9. select Full Control from the permissions menu
(click the Widnows Defender folder)
10. 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)
11. Open services.msc
12. find Windows Defender
13. there should be 2 services: Windows Defender Service and Windows Defnder Netwrok
14. right click each and press start
15. after you have started both restart your computer
16. Run Windows Defender
I Hope this Helps!
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