Windows 10: windows defender cannot be start.

I cannot start windows defender. It say “unexpected error. sorry, we ran into a problem. please try again”.

I tried several workarounds I found in this forum and other forums:

1. Remove other antiVirus/AntiSpayware programs -> I never had any...
2. Enable default Administrator account to see if issue exist -> It is the same even for default Administrator account.
3. Set all registry entries with DisableAntiSpyware / DisableAntiVirus to zero. -> value was already zero (or key was missing)
4. Try start "Windows Defender Antivirus Service" -> Service dialog is all disabled. start/stop/pause/resume buttons are all disabled. event in default administrator account...
5. Try to start "Windows Defender Advanced Threat Protection Service" -> When clicking the start button, it try to start but prompt an error: "The Windows Defender Advanced Threat Protection Service on local computer started and then stopped"
6. change Local Group Policy for windows defender (both user and computer level) to "Not configured" -> the value was already "Not configured"...
7. start windows without any startup program -> did not help
8. start windows in "safe boot" mode -> did not help
9. start windows after disabling all non-windows services -> did not help
10. run sfc /scannow -> did not help
11. scan computer with Malwarebytes -> fond nothing

Searching the windows Event log, I can see the following errors:

• Event provider ProtectionManagement attempted to register query "select * from MSFT_MpEvent" whose target class "MSFT_MpEvent" in //./root/Microsoft/Windows/Defender namespace does not exist. The query will be ignored.
  
• The Windows Defender Application Guard Filter Driver service failed to start due to the following error: A device attached to the system is not functioning.

I have the feeling that some malware disabled/corrupted windows defender files/settings...

:)

 

window defender

• • • 
      You will want to print these instructions for offline reference -
      

IMPORTANT => DON'T SKIP ANY STEP perform all Steps in one uninterrupted session - If a Step says to reboot
reboot.

Problems starting Windows Defender in Windows 8/8.1/10

Pləase let us know what fixes the problem or if the pяoblem remains.

• • • 
      `~`
      

 

Windows Defender Anitvirus

Hello,

There are multiple reasons why you are having issues, enabling Windows Defender. To assist you with your concern, you can refer to
PrashantKumar96's
Forum Article on how to fix Windows Defender not starting.

We suggest that you try the troubleshooting steps listed there, especially the number six troubleshooting step.

Let us know of the outcome.

Regards.

 

Windows Defender problem

Hi Ernst,

To troubleshoot this issue, we suggest that you check the Windows Defender service if it's running. If you are using a third party spyware/malware program, it may disable the Windows Defender service. To do this, please follow the steps below:

• Press Windows + R key.
• Type services.msc.
• Right-click Windows Defender service and click
  Start.

Let us know the result.