Windows Defender The Threat Service has stopped in Windows 10

Sometimes, when trying to run Windows Defender, you may see this message The Threat Service has stopped, Restart it now. If you click on the Restart now button, and the Service starts, and the message disappears, well and good! But if it does not and you instead see a message Unexpected error, Sorry, we ran into a problem displayed, then here’s what you can try to fix the issue on your Windows 10.

The Threat Service has stopped

The Threat Service has stopped

1] Ensure that Windows Defender Services are started

The Windows Defender Advanced Threat Protection service helps protect against advanced threats by monitoring and reporting security events that happen on the computer. You need to ensure that this and other required Services are set to their default values and started.

Open Windows Services Manager and locate the following Services and ensure that their Startup type is set to their default values:

  • Windows Defender Advanced Threat Protection Service – Manual
  • Windows Defender Antivirus Network Inspection Service – Manual
  • Windows Defender Antivirus Service – Manual
  • Windows Defender Firewall Service – Automatic.


You may right-click on each of them and select Start to start the Service.

To change the Staup types, you have to double-click on the Services and select the correct option from the drop-down menu of Startup type, in its Properties box.

When found, double-click on the each of the services and set up their Startup type to Automatic and click on the Start if the services are not already running.

Click on the Apply and then OK and see if this has helped.

2] Edit the Registry

If the above method did not help, try this.

Run regedit to open theRegistry Editor and go to the following path –

HKLM\Software\Policies\Microsoft\Windows Defender

If the DisableAntiVirus and DisableAntiSpyware DWORDs are present in the right pane, change the value to 0.

If they are not present, then create the two DWORDs and give them a value of 0 each. To do this, in the right pane, right-click on an empty spot, select New > DWORD, name them as mentioned above. Then double-click on them and give them each a value of 0.

This should help!

Posted by on , in Category Security with Tags
Anand Khanse is the Admin of, a 10-year Microsoft MVP Awardee in Windows (2006-16) & a Windows Insider MVP. Please read the entire post & the comments first, create a System Restore Point before making any changes to your system & be careful about any 3rd-party offers while installing freeware.