Can't turn on,scan or any other thing through Windows Defender

I can't scan through my windows defender even I can't see the scan dialogue windows.When I tried to turn it on then the following windows have shown...

 

Question Info


Last updated May 13, 2019 Views 43 Applies to:
Hi,

My name is Angel. I am an Independent Advisor. Thank you for posting in Microsoft Community.

Open Start, type: regedit
Right click regedit
Click Run as administrator

Navigate to the following registry key:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SecurityHealthService

and modify the Start value from 4 to 2. Restart your computer to re-enable the Windows Defender Security Center Service.

Press Windows key + R
Type: services.msc
Hit Enter

Press Windows key + R
Type: services.msc
Hit Enter

Scroll down to Windows Defender Security Center Service
Double click it
Set its Start up type to Automatic

Click Start
Click Apply then OK

Restart

If that does not work, perform a repair upgrade.
https://answers.microsoft.com/en-us/windows/for...

Source: https://answers.microsoft.com/en-us/subject/for...

Hope the information provided is useful. If the issue persists, reply here and we will be glad to help you.

Angel.

Registry disclaimer

To do so: Important this section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:

How to back up and restore the registry in Windows

http://support.microsoft.com/kb/322756/

Did this solve your problem?

Sorry this didn't help.

Great! Thanks for marking this as the answer.

How satisfied are you with this reply?

Thanks for your feedback, it helps us improve the site.

How satisfied are you with this response?

Thanks for your feedback.

Hello,

I'm Independent Advisor and Microsoft MVP, here to help you with your question.

Please try these suggestions:

Run services.msc to open Services Manager. Ensure that the Windows Defender service is started and set to Automatic.

You may need to re-register the following dll files and see if it helps you. Run each command in an elevated command prompt one after the other and hit Enter:

regsvr32 wuaueng.dll
regsvr32 wucltui.dll
regsvr32 softpub.dll
regsvr32 wintrust.dll
regsvr32 initpki.dll
regsvr32 wups.dll
regsvr32 wuweb.dll
regsvr32 atl.dll
regsvr32 mssip32.dll

Also run regedit command and navigate to the following key:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Defender

Here ensure that the value of these DWORDS is 0 : DisableAntiSpyware and DisableAntiVirus.

Let us know if this helps!
_____________________________________________________________________________________

Helping Windows users, since 2010 · Please remember to mark replies as answers, if they helps!

Did this solve your problem?

Sorry this didn't help.

Great! Thanks for marking this as the answer.

How satisfied are you with this reply?

Thanks for your feedback, it helps us improve the site.

How satisfied are you with this response?

Thanks for your feedback.