The error code 0xa0000400 may appear when users try to install Windows Anniversary Update. This is an annoying thing and many people want to settle it down completely. Noticing this, I decided to introduce some useful methods for solving the problem effectively. You just need to follow the steps given below.

Like any other systems, a lot of problems and issues may appear on Microsoft Windows 10. For example, you may encounter the 0xa0000400 error code when upgrading your system. Many people want to know how to fix the issue, that’s why I’m here, writing this article. I will provide some practical solutions to help you fix Windows 10 error 0xa0000400. Please read them carefully!

Windows 10 error 0xa0000400

If you have finished the update and find some files are lost, you should read this:

[Update 2022] How To Recover Lost Files After Windows Update
[Update 2022] How To Recover Lost Files After Windows Update

You must be eager to know the way to recover lost files after Windows update if you find needed files disappeared after the update.

Read More

Windows 10 1809 0xa0000400

Upgrading your system is actually an essential process when there are bugs and obvious shortages. Yet, the process may be interrupted by Windows 10 error code 0xa0000400. No matter which Windows 10 update tool you’re using to upgrade the system, the 0xa0000400 error may occur on 1809, 1803 or other versions of Windows 10 (the Windows 10 anniversary update download could also lead to error 0xa0000400).

  • Windows 10 Upgrade Assistant
  • Windows 10 Media Creation Tool
  • Windows 10 Upgrade Advisor

The actual cause for this upgrade error is not clear. But, what I’m sure is that you need to take measures immediately when something is going wrong during the upgrade process so as to fix Windows 10 issue properly. I will provide you with several useful solutions to fix the problem, please follow the steps with care.

How to Fix Windows 10 Error 0xa0000400

Solution 1: Disconnect All Peripherals

This may be the earliest way to settle down error 0xa0000400. Please disconnect all the peripherals (such as game controller, digital camera, and USB drive) from your computer where the error code appears unless they are indispensable.

The reason why I advise you to disconnect peripherals is that they may cause conflicts and failures during the process of updating the Windows operating system. After disconnecting, you should restart the Windows 10 update process in a specialized tool.

Solution 2: Remove Junk System Files

In the system which has been used for a while, there will be many residual junk system files (such as cache files and driver residue). These junk files can prevent an update, so I’ll show you how to remove them.

  1. Click on Cortana textbox in the taskbar and type disk cleanup (click here is the taskbar is not working).
  2. Right click on the Disk Cleanup (Desktop app) from search result.
  3. Choose Run as administrator.
  4. Select the system drive (usually C:) and click on the OK button.
  5. Wait for the scanning process.
  6. Check the files you want to delete and click on the OK Please remember, the main files you need to remove are Previous Windows Installations.

use disk cleanup to remove files

Solution 3: Try Troubleshooting As an Administrator

  1. Open Control Panel by the way you like.
  2. Select to view items by Small icons.
  3. Choose Troubleshooting from the list.
  4. Select View all from the left pane.
  5. Find and click on the System Maintenance option.
  6. Click on the Next button in the System Maintenance window.
  7. Select Try troubleshooting as an administrator.
  8. It will detect issues automatically.
  9. Wait to see if any problems have been found; if found, please fix it.

Try troubleshooting as an administrator

In addition to the above methods, you should also try the following ways to fix Windows 10 error 0xa0000400:

  • Get the official ISO files.
  • Turn off the Internet connections at a specific time.
  • Get a newer version of Media Creation Tool.
  • Free up additional disk space.
  • Update the drivers of your computer.
  • Reset Updates.
  • Run a PC optimization tool.
  • Install the update manually.

Click here to know more about Windows 10 update problems and fixes.

  • Linkedin
  • Reddit