How to Fix Windows 11/ 10 Update Error 0xA0000400

When you try to update Windows 11 or 10 through Update Center, you may encounter the error code 0xA0000400. The culprit of error 0xA0000400 can be failures associated with the update service, problems with update components, corrupted system files or SoftwareDistribution and Catroot2 folders. Let us analyze in this manual how to fix Error 0xA0000400 in Windows 11 and Windows 10 when updating.

Error 0xA0000400 message

The message shows, “Something went wrong. Select Try again, and if that doesn’t work, contact Microsoft for help. Error Code 0xA0000400”. It appears when you try to update your PC using Windows 11 Installation Assistant.

Fix Windows 11/ 10 Update Error 0xA0000400

1. Resetting the SD and Catroot2 folders

Run Command Prompt or Terminal as Administrator and enter the below commands.

net stop wuauserv
net stop cryptSvc
net stop bits
net stop msiserver
ren C: \ Windows \ SoftwareDistribution SoftwareDistribution.mwp
ren C: \ Windows \ System32 \ catroot2 catroot2.mwp
net start wuauserv
net start cryptSvc
net start bits
net start msiserver

With the above commands, we will stop the services associated with the update centre so that they do not prohibit renaming folders; after renaming SoftwareDistribution and Catroot2, we will start them back. Next, try updating your system.

2. Cleaning up unnecessary files

Some old unnecessary files can interfere with the main ones by getting confused in versions. In this case, you should clean the system. To do this, press Win + R and type cleanmgr. Then follow the instructions on the screen.

3. Install the patch manually

Microsoft has an updated directory where you can download individual patches to install them. You enter the patch number into the search box and download it for your version of Windows. If it is unclear, then there is a complete guide on manually installing patches.

4. Upgrade from Media Creation Tool/ Installation Assistant

Go to the Microsoft website and download the MediaCreationTool utility for Windows 10 by clicking on “Download Tool Now”. Start running it and install “Update this PC now”. If you are a Windows 11 user, run the Windows 11 Installation Assistant as an Admin.

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