How to fix 0xC03F6603 Microsoft Store error in Windows 11/10?

In this article, we are going to talk about 0xC03F6603 Microsoft Store error in Windows 11/10. You might encounter this issue while trying to install or update games through Microsoft Store or Xbox game pass. So, if you are dealing with this issue and are looking for its remedy, you are on the right page. Check below what you should to do that effect.

What to do to fix 0xC03F6603 Microsoft Store error in Windows 11/10?

Fix 1: Run Windows Apps Troubleshooter

Let you know, this is a built-in Troubleshooter app from Microsoft on Windows to check out for various common glitches that come up with various running apps within system and repair them. It is possible that there is something wrong with the Store app installed on your PC why you are receiving the issue under discussion. So, use the Windows Apps Troubleshooter to find and fix it:

  • Press Win+ I to open Windows Settings,
  • Scroll down and select System tab,
  • Under it, find Troubleshoot option and click on it,
  • Further, click on Other Troubleshooters and locate Windows Store Apps,
  • Click on Run to start the troubleshooting process,
  • Soon enough, you will be notified about the bug causing this issue and suggested fix for it.

Fix 2: Repair and Reset Microsoft Store App and Xbox

If the previous option does not work, you should reset the Microsoft Store app and then the problematic Xbox to see if this helps you in resolving the problem:

  • Press Win+ I to open Windows Settings,
  • Click on Apps tab,
  • Select Installed Apps tab and type Microsoft Store in the search area,
  • Right-click on the three dots next to it to open Advanced Settings,
  • There, you will find an option to Repair or Reset the Microsoft Store.

Firstly, try resetting it and if this does not work, you should look for repair option. You should replicate this process with Xbox app the then and also with the Xbox game that is causing the issue.

Fix 3: Uninstall and Reinstall Microsoft Store

If 0xC03F6603 Microsoft Store error in Windows 11/10 continues, you should run the below command in an elevated PowerShell window to uninstall Microsoft and fresh-install it:

  • Open PowerShell as Admin and run this command under it:

add-appxpackage -register “C:\Program Files\WindowsApps\*Store*\AppxManifest.xml” -disabledevelopmentmode

  • Check if this resolves your issue.

Fix 4: Change your internet connection

There might be an internet based issue. You should change your internet connection and see if this works. You can also use VPN instead to see if this helps.

Fix 5: Download the game passively

If 0xC03F6603 Microsoft Store error in Windows 11/10 remains, you can passively download the game that you face trouble with when downloading it. This works for many users. Here is how you can do that:

  • Firstly, pause all existing downloads on Microsoft Store,
  • Then, start downloading the game showing you the issue,
  • Soon the process starts, restart your computer,
  • Now, when the system reboots, go to the Action Center to track your download,
  • This will result you in downloading the game without Error 0xC03F6603.

PC Repair Tool is an automatic Windows Repair Tool. it works excellent in dealing with any issues due to system inconsistency. You should use this tool if the above-mentioned fixes do not fix your issue.  Here is its direct download link.


That’s all! We have provided all possible fixes for 0xC03F6603 Microsoft Store error in Windows 11/10. Hopefully, these fixes are helpful for you in resolving the problem. Comment down below in case of any queries, questions or suggestions regarding the article.