How to fix Windows Update Error 8024400a?

Alton Alexander
By Alton AlexanderUpdated on June 4th, 2022

Windows Update error code 8024400a is caused by a problem with the Windows Update service. This service is responsible for downloading and installing updates for the Windows operating system. When the service is not working properly, it can cause update errors like 8024400a.

There are a few different reasons why the Windows Update service might not be working properly. It could be a problem with the server that hosts the update files, or there could be an issue with the Windows Update client on the user's computer. In some cases, the problem could be a combination of both.

If you're seeing error code 8024400a when you try to update Windows, there are a few things you can try to fix the problem. First, you can restart the Windows Update service. This will sometimes fix temporary problems that are preventing the service from working properly.

If restarting the service doesn't help, you can try resetting the Windows Update client. This will delete any temporary files that might be causing the client to malfunction. Finally, if neither of these solutions works, you can try manually downloading and installing the updates that are causing the error.

Users typically search for a solution by asking about:

  • error code 8024400a
  • windows update error 8024400a

1. Restart the computer and try again

  1. Click the Start button
  2. Type "cmd" in the Start Search box
  3. Right-click on "cmd" and select "Run as Administrator"
  4. Type "cmd" and hit Enter
  5. Type "net stop wuauserv"
  6. Type "net start wuauserv"
  7. Type "net stop msiserver"
  8. Type "net start msiserver"
  9. Type "net start wuauserv"
  10. Type "net stop wuauserv"
  11. Type "net start msiserver"
  12. Type "cmd" and hit Enter
  13. Type "net start msiserver"
  14. Type "cmd" and hit Enter
  15. Type "msinfo32"
  16. In the left pane, under "Computer Name," right-click on the computer name and select "Properties."
  17. In the "General" tab, under "Startup Settings" click on the "Restart" button.
  18. Click on the "Yes" button when the computer restarts.
  19. In the "Windows Update" dialog box, click on the "Check for Updates" button.
  20. If there are any updates, click on the "Update" button.
  21. If there are no updates, click on the "Restart Now" button.
  22. After the computer restarts, log on and try to install the windows update again.

2. Check for updates again

  1. Open the "Windows Update" app on your computer.
  2. Click on the "Check for updates" link.
  3. If there are any new updates available, they will be listed on the main screen.
  4. Click on the "Install updates" button to install them.
  5. If there are any errors, the app will tell you about them.
  6. Fix any errors and try to install the updates again.

3. Try a different method of updating Windows

  1. Open "Command Prompt" as an administrator.
  2. Type "wuauclt.exe /updatenow" and press Enter.
  3. If the update is successful, the command will return without any errors.
  4. If the update fails, the command will return with an error code.
  5. Use the "ErrorLevel" command to determine the specific error code.
  6. Try the update again using the appropriate command.

Some users might also have success with the following opitons:

  1. Run the Windows Update Troubleshooter.
  2. Contact Microsoft support.