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Error code 0xa0000400: How to repair Windows Update

  • Oct 29, 2025
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Error code 0xa0000400 occurs when a Windows update fails to install completely. What you can do to fix the error, we will tell you in this practical tip.

With an in-place upgrade through the Media Creation Tool, you can often fix the problem of an incorrectly downloaded update package. Be sure to select "Keep personal files and apps". Screenshot: Ferdinand Pönisch

What else you can do

If the error still appears despite installing with the Media Creation Tool, you should perform a Disk Cleanup . This deletes superfluous files that may hinder the update.

  1. Call up Disk Cleanup via the Windows Start menu and click on "Clean up system files" in the new window.
  2. Check the "Temporary Windows installation files" and "Temporary files" items and confirm with "OK".
  3. If this doesnt help either, the problem is probably Microsoft itself. Sometimes Microsoft releases buggy update packages. In this case, you can use the Reset Windows Update Tool to reverse the failed update.
  4. Then deactivate the automatic updates and try to carry out the update at a later time.
Deleting temporary installation files in Disk Cleanup can also fix the error. Screenshot: Ferdinand Pönisch

Also interesting:

  • Error 0x80080005: How to Fix Your Windows Updates
  • Fix Windows error code 0x800f0831: Heres how
  • Preparing Windows: what to do if its taking a long time?

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