How to fix Windows Defender service won’t start on Windows 10

Windows Defender is more than just an anti-virus app. It provides many other protections in addition to ransomware protection, browser-based protection against malicious websites, and on-demand file scans.

To do this, it runs several basic services. These services start automatically if Windows Defender is enabled. A user usually does not need to intervene.

repair that does not start Windows Defender service

Fix Windows Defender service will not start

Windows Defender is an essential service running on Windows 10. If you want to use Windows Defender, you cannot stop this service. If the service does not start, Windows Defender will not do either. Here’s what you can do if the Windows Defender service doesn’t start.

1. Disable third-party anti-virus apps

One of the main reasons is that Windows Defender will not run or may not start its services if you have another anti-virus app running on your system. Windows Defender does not normally run when another anti-virus is running.

Turn off the third-party anti-virus and restart the system. If the service and Windows Defender do not work, uninstall the third-party anti-virus and restart the system.

2. Check the Windows Defender service startup options

The Windows Defender service should start automatically when you launch your system. However, if the service is ready to start manually, Windows Defender will not run automatically.

  1. Tap on the Shortcut Win + R keyboard to open the run box.
  2. In the run box, apply services.msc and tap on the Enter key.
  3. Look for the Windows Defender firewall service and double click on it.
  4. in the Lower start type, select automatic.
  5. Click on the Start button.

3. Change registration settings

Windows Defender can be disabled from the menu. If disabled from the registry, the Windows Defender service will not start. You must first enable it from the menu.

  1. Tap on the Shortcut Win + R keyboard to open the run box.
  2. In the run box, apply regedit and tap on the Enter key.
  3. go to this key: HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesSecurityHealthService
  4. Double-click the starting value and set it to 2.
  5. Restart the system.
  6. Enable Windows Defender.

4. Look for environmental variables

Users are free to edit their changing environment, however, users should not remove any of the added paths by default. Check that the path to the% ProgramData% variable is set correctly. If it does not, it will prevent Windows Defender from working.

  1. Open File Explorer.
  2. Enter this explorer shell:::{BB06C0E4-D293-4f75-8A90-CB05B6477EEE} in the location bar and tap on the Enter key.
  3. Click Advanced system settings in the left-hand column.
  4. Go to Advanced Tab and click Environmental variables.
  5. Select% ProgramData% and it should point to C: ProgramData. If not, edit and update the path.
  6. Click Ok and restart the system.

5. Change permissions for ProgramData

The ProgramData folder is an important system folder. If the permissions of the wrapper have been changed, it will affect Windows Defender.

  1. Open File Explorer.
  2. Open the C drive or whatever the Windows driver is.
  3. Right-click ProgramData package and choose properties from the context table.
  4. Go to Security tab.
  5. Click Advanced at the bottom
  6. Disable all owned permissions.
  7. Click Install and restart the system.

Note: ProgramData is a hidden folder. You have to enable hidden objects to access it.

6. Run a system scan

If files on Windows 10 have been corrupted, Windows Defender will not start. You can use SFC scan tool to scan and repair damaged files.

  1. Open Promptly forward with administrative rights.
  2. Run this command: scf /scannow.
  3. Let the command terminate and enable Windows Defender.

7. Install Upcoming Updates

Windows Defender receives regular updates on virus definition. If these updates are not installed, you may be having problems getting the virus running.

  1. Open the Configuration application with keyboard shortcut Win + I.
  2. go to Update & Security.
  3. Select the Windows Update Tab.
  4. Click Check for updates.
  5. Install available updates and restart the system.

8. Create a new user

It is possible that the files for the default user have been corrupted outside of repair. The easiest way to do this is to create a new user interface and enable Windows Defender. If enabled, you can switch to the new user, make it a system administrator, and remove the old account.

  1. Open the Configuration application with keyboard shortcut Win + I.
  2. go to Accounts.
  3. Choose Family & others.
  4. Click Add someone else to this PC.
  5. Configure a new, local account.
  6. Sign in to the new account and enable Windows Defender.

9. Reset Windows 10

If creating a new user doesn’t work, it’s time for the nuclear option; reinstall Windows 10. You will keep all your files but the apps will be removed.

  1. Open the Configuration application with keyboard shortcut Win + I.
  2. go to Update & Security.
  3. Select the Recovery Tab.
  4. Click Get Started under Reset this PC.
  5. Choose the option that allows you keep your files.
  6. Follow the on-screen instructions and the PC will be reset.

Conclusion

A computer should not be virus free. If Windows Defender is not running, and you do not have another anti-virus application in place, your system is at risk of infection. The above solutions should apply Windows Defender.

The post How to set Windows Defender service will not start on Windows 10 appearing first on TechtricksNg.

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