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How to Fix Microsoft Store Error 0xc03f40c8 on Windows 10 and 11

The Microsoft Store is a great place to find Windows apps. You can search and download almost all your favorite apps and games in no time.

However, when an app finishes downloading, you may get error 0xc03f40c8. If you are facing this problem, we have listed some tried and tested methods to fix Microsoft error code 0xc03f40c8 on Windows.


What causes Microsoft Store error 0xc03f40c8?

Microsoft Store error 0xc03f40c8 can occur for the following reasons:

  • A slow internet connection is one of the main causes of Microsoft Store error 0xc03f40c8.
  • There are high chances that the downloaded application files got corrupted during the downloading process and led to the mentioned error code.
  • Another possibility is that Microsoft Store cache files are corrupted. Windows stores some essential files (cache) that allow the Microsoft Store to function properly. If the cache files are damaged, you might have issues with the Microsoft Store.


Now that you know all the causes of Microsoft Store error code 0xc03f40c8, continue reading the suggested methods to fix it.

1. Use Windows Store App Troubleshooter

Microsoft has developed many different troubleshooters to fix Windows issues. One of them is the Windows Store app troubleshooter, which is a fantastic way to fix all sorts of store issues.

Here’s how you can launch the Windows Store Apps Troubleshooter in Windows:

  1. Open Windows Settings by pressing the Win + I keys together.
  2. Under the System tab, click Troubleshooting > Other troubleshooters.
  3. Scroll down and click To run next to the Windows Store apps option.
  4. Follow the onscreen instructions and apply any fixes recommended by the troubleshooter.
  5. Once you have applied all the patches, click Close convenience store and restart your PC.


That’s it. Now you can check whether the error code appears or not by downloading and updating the apps in the Microsoft Store.

2. Troubleshoot the network

A poor network connection is the most common cause of error code 0xc03f40c8.

When you download an app with a slow connection, Microsoft Store sometimes fails to download some data during the process. This eventually leads to issues like apps crashing in Windows and different error codes.

To troubleshoot the network, you can run the Internet connections convenience store first, followed by Network adapter convenience store. If you’re not a geek, check out our article How to Fix No Internet Access on Windows for detailed steps.

3. Re-register the Microsoft Store app using PowerShell

In simple terms, re-registering the Microsoft Store app means reinstalling it on Windows. If you have already tried the methods above but are still having trouble with the error code, you should register again.

Follow the steps below to re-register the Microsoft Store app using PowerShell:

  1. Right click on the Begin menu button and click Windows PowerShell (administrator).
  2. Now copy the command below and paste it into the PowerShell:
    Get-AppxPackage -AllUsers *WindowsStore* | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)AppXManifest.xml"}
  3. press the Walk in key on your keyboard to execute the command.
  4. Once done, restart your PC and open the Microsoft Store again to check the error code.

If you get the “A position parameter was not found“, copy the code again and make sure you don’t copy anything more. This only happens when the code you typed includes an extra line of space.

4. Delete Microsoft Store Cache

Cache files are temporary files stored by apps to help them run smoothly, and the Microsoft Store has its own. If you can’t download or update apps from the Microsoft Store, clearing the cache might help.

Here are the steps to clear Microsoft Store cache files:

  1. Hurry Win + E to launch File Explorer.
  2. Go to the following location: C:UsersAppDataLocalPackagesMicrosoft.WindowsStore_8wekyb3d8bbweLocalCache and delete all files in the current folder.
  3. Now go to C:UsersAppDataLocalPackagesMicrosoft.WindowsStore_8wekyb3d8bbweLocalState rental, replacing by your own name.
  4. Delete all files from the LocalState folder.
  5. Open the Microsoft Store and download any app to see if the error code still appears.

5. Reset the Microsoft Store

Resetting the Microsoft Store is highly recommended if all the basic troubleshooting methods are not working for you. You don’t have to worry about your files, because resetting the Microsoft Store doesn’t remove installed apps or change your current account settings.


See our quick guide on how to reset the Microsoft Store in Windows 10 and 11 for help.

6. Choose the appropriate date and time

The Microsoft Store downloads all apps and games from a secure server. This server checks that the date and time on the client side are correct. So, if you accidentally changed the date and time on your PC, you might have unknowingly triggered error code 0xc03f40c8.

Follow our guide on how to change the date and time in Windows to fix these download errors. Once done, remember to flush the DNS cache by typing the following command in the command prompt:

ipconfig /flushdns

7. Repair all corrupt Windows files

If none of the above mentioned methods worked for you, chances are the main Windows files are corrupted.

There are many different reasons why a file gets corrupted such as system instability and malware to name a few. If this is your case, you have two options: you can either repair corrupted Windows files or factory reset your Windows PC or laptop.

Before proceeding, note that a factory reset will result in complete data loss and Windows will be reset to its default state. So, remember to have a full backup of all your important files before making one.

Fix your problems with Microsoft Store apps

Hopefully, if you followed the guide correctly, error code 0xc03f40c8 should no longer appear.

Sometimes these errors seem to appear on their own, but sometimes they are caused by something the user does. For example, you can avoid many Windows-related errors by simply keeping your Windows up to date.