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Windows Defender not turning on windows 10


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#1 timcook8

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Posted 06 May 2016 - 05:59 PM

So, I have tried every thing. and can not get the service to turn on. Tried this...

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

 

The problem is when I try to start the service, it fails to start. 577 error. Thoughts?



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#2 quietman7

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Posted 06 May 2016 - 06:13 PM

The inability to turn on Windows Defender 8/10 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 during 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, Windows Defender will be turned off (disabled). Windows Defender recognizes the install and automatically disables itself when other anti-virus products are used to avoid conflicts. Windows Defender will remain disabled until that anti-virus software has been completely uninstalled.

If that is not the case in your situation, then please refer to this topic.

 


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#3 Agouti

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Posted 06 May 2016 - 07:37 PM

I am confused.  Why go into the registry and change ownership?  AFAIK, you don't have to tamper with the registry and services console to start Windows Defender.  Maybe if you explain why you are doing this, we'll be a little closer to understanding what you are trying to achieve.



#4 timcook8

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Posted 06 May 2016 - 07:52 PM

Customer had a virus from somewhere. Got rid of all malware but one of them shut off WD and wont let me restart the service. in fact it deleted most of the policy keys in the reg. I got those back and st the correct policies but still wont start. get the 577 error which every where says to go start the service. Well the service wont start in services.msc. also wont start in the control panel/defender. Does that help?


Also ran sfc and chkdsk several times with no corrupt entries



#5 quietman7

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Posted 06 May 2016 - 08:26 PM

Did you check for other security software (past or present) which may be causing the problem?
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#6 timcook8

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Posted 06 May 2016 - 08:37 PM

That is the first thing I checked for. It is running 10 home. I am wondering if I upgrade to pro if it will reset the defender settings . Seems like it must be missing dll files or some other important files for WD. Wish you could uninstall and reinstall defender.



#7 quietman7

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Posted 06 May 2016 - 09:07 PM

Yes...with anti-virus software, an uninstall/reinstall solves most problems.

Here is another suggestion which sometimes works:

Open an Elevated Command Prompt
* At the command prompt C:\>_, type: sc start WinDefend Enable
* Press Enter.
* Restart the computer.
* Then try opening Windows Defender again.
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#8 timcook8

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Posted 07 May 2016 - 12:36 PM

Ill try it and let you know. Thanks. Keep the ideas coming just in case too please.



#9 quietman7

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Posted 07 May 2016 - 07:18 PM

You're welcome and good luck.
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