How to Troubleshoot Windows Defender Error 0x800106ba on Windows 10 Computer

Recently, we encountered users encountering Windows Defender error code 0x800106ba on Windows 10 PC. This is a very common error message that often appears when certain settings do not match. Anyway, here we will try to analyze the possible causes of its occurrence along with the corresponding solutions.

What causes Windows Defender error 0x800106ba?

  • Conflict with third-party antivirus programs.
  • Outdated Windows Defender firewall
  • System infected with malware
  • Damaged, corrupt, or missing Windows Defender update files
  • Incorrect registration of important Windows Defender files in the system.

How to resolve Windows Defender error 0x800106ba?

Check for the latest Windows updates

  1. Open the Settings application by pressing the Windows + I keys.
  2. Select Update and security and click Check for updates.
  3. Let the system check for available updates and install them all.
  4. Finally, reboot your system.

Registering DLLs

  1. While holding down the Windows key, press R.
  2. In the Run dialog box, type regsvr32 wuapi.dll and click OK.
  3. Repeat the steps for the following DLLs, replace the DLL file with the next one, and save them all.
    wuaueng.dll, wucltui.dll, wups.dll, wuweb.dll, atl.dll, softpub.dll, Wintrust.dll, Initpki.dll.
  4. Then disable all other antivirus applications on your computer and try to open Defender.

Set the Windows Defender service to Automatic

  1. Type Services in Windows search and select Services from the list.
  2. Find Windows Defender and double-click it.
  3. Select Startup Type and set it to Automatic.
  4. Click Apply and OK to save your changes.

Frequently Asked Questions

  1. Open the Settings app by pressing Windows + I.
  2. Select Update and security and click Check for updates.
  3. Let the system check for available updates and install them all.
  4. Finally, reboot your system.

  1. Select Start -> Settings -> Update and Security -> Windows Security, then Firewall and Network Protection. Open Windows Security Settings.
  2. Select a network profile.
  3. Under Microsoft Defender Firewall, set it to Enabled.
  4. To disable it, set the setting to Disabled.

  1. Disable and uninstall third-party antivirus solutions.
  2. Install the latest Windows updates.
  3. Run an SFC scan.
  4. Clean your registry.
  5. Check your environment variables.
  6. Change system permissions.
  7. Create a new user account.
  8. Perform an onsite update.