If disabling the antivirus didn’t work, uninstall it temporarily and check for the same. Disable any antivirus software installed on your device and check if the windows defender service starts running. Third-party antivirus software installed on your device can also cause this issue. Click on Apply and then on Ok to save the changes.Navigate to the Group Membership tab and select Administrator.

Choose the profile to modify and click on Properties.

Press Windows key + R to open the Run dialogue box.

To fix this, switch the user account using the admin profile. This error can also occur due to a lack of access permissions.

Restart your device and check if the Windows Defender service not starting in Windows 11 issue is fixed.įix 5: Switch Account using Admin Profile.

Type the following commands one by one and hit enter.ĭISM /Online /Cleanup-Image /CheckHealth DISM /Online /Cleanup-Image /ScanHealth DISM /Online /Cleanup-Image /RestoreHealth.

Run a DISM Scan to repair any system image corruptions on your device. System image corruptions are also known to cause issues like these.

Once done, restart your device and check if the issue is fixed.

Now press Shift + Del to delete all the files permanently.

Press CTRL + A to select all temporary files.

Press the Windows key + R to open the Run dialog box.

These files get corrupt sometimes and cause various problems on your device.

Close the Command Prompt, restart your device, and check if the Windows Defender service opens.Įrrors like these can occur if your PC if too much temporary files are accumulated your device.

Type the following command and hit enter.

Click on Start, search for Command Prompt and click on Run as Administrator.

Windows 11 windows defender not working