How to Resolve Windows Defender Error Code 0x800700AA (The service couldn’t be started)

  • Error 0x800700aa prevents Windows Defender from starting normally.
  • This is an important issue because our devices are left unprotected.
  • We can see this when we try to run a system scan or open a Microsoft antivirus program and this message appears.
  • There could be several reasons, but we also have several solutions to make it work properly.
  • In some cases, this error can occur because of a conflict between a third-party process or service and Windows Defender.

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Windows 10’s service process is accessed through the Start Menu by typing Services.

If a Windows 10 user runs a Windows Defender scan, they always receive the error code 0x800700aa. It has been reported that some users encounter this error code only when running Windows Defender, while others see it every time they try to boot up.

When Windows Defender fails to start normally, error 0x800700aa occurs. As a result of this error, many types of attacks may be able to attack our devices and leave them unprotected. This message appears whenever we try to run a system scan or open a Microsoft antivirus program. Several reasons could be at play, but there are also several ways to fix this.

What causes Windows Defender error 0x800700AA?

What is the "Your virus and threat protection is managed by your organization" bug?

Some users report receiving the code 0x800700aa at startup, while others report the issue only occurs when running Windows Defender on Windows 10. In some cases, the error code appears when Windows Defender is run, but in others, it appears when it’s started. In this article, we’ll explain how to fix Windows Defender Error 0x800700AA in Windows 10.

Damaged system files: It turns out that in most documented cases, this error code appears when some operating system dependencies required by Windows Defender utilities become corrupted.

Conflict with a third-party application: In some cases, this error can occur because of a conflict between a third-party process or service and Windows Defender.

How to fix Windows Defender error 0x800700AA?



Updated: February 2024

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Re-register the Windows Defender DLL files

  1. Command line window extended open.
  2. Press Enter after entering each command:
  • Wuaueng.dll needs to be registered with Regsvr32
  • Wucltui.dll must be registered with Regsvr32
  • Softpub.dll is registered as part of Windows
  • DLL Wintrust.Regsvr32
  • Dll initpki.reg
  • WUPS.DLL can be found by running regsvr32
  • The wuweb.dll file should be registered by regsvr32
  • Atl.dll is registered by Regsvr32
  • The mssip32.dll file should be registered with regsvr32

When you run Windows Defender automatically or manually after this step, you shouldn’t get the error message with code 0x800700aa.

Change the value of the WinDefend key in the registry editor

  1. Open the registry editor by going to the Run dialog box, typing Regedt32.exe, and pressing Enter.
  2. Here is the directory where you can find the files:
    In HKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/Services/WinDefend service.
  3. WinDefend’s key should be owned by you.
  4. You can find the Start DWORD in the right pane of the key after you have acquired ownership.
  5. By default, DWORD should be 2 since you ran into a problem. You should set it to 4 so that it remains the same.
  6. This problem was caused by different cost data. Double-click the same DWORD to solve the problem.
  7. Put 2 instead of 4 in the box above.
  8. Then click OK.
  9. Once the registry editor is closed, you can activate Windows Defender protection by clicking the Start button.

Check the status of the Windows Defender service

Make sure the following services are in compliance with the specified status by running the services.MSC file (service manager):

  • Firewall is automatically running under Windows Defender
  • Using the Advanced Threat Protection feature of Windows Defender
  • This document provides guidance on how to use the Microsoft Defender Antivirus Network Inspection Service
  • This document provides guidance on how to use the Microsoft Defender Antivirus Network Inspection Service.



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Frequently Asked Questions

  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.

  1. Open the Classic Control Panel (not Settings).
  2. Click on Windows Defender Firewall.
  3. Click Restore defaults.
  4. Click Restore defaults a second time.

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

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Mark Ginter is a tech blogger with a passion for all things gadgets and gizmos. A self-proclaimed "geek", Mark has been blogging about technology for over 15 years. His blog, techquack.com, covers a wide range of topics including new product releases, industry news, and tips and tricks for getting the most out of your devices. If you're looking for someone who can keep you up-to-date with all the latest tech news and developments, then be sure to follow him over at Microsoft.