How to Fix COD Warfare 3 Error “Your Operating System Windows 8/7 Is Not Supported” Error

Are you facing the ‘Unsupported operating system’ error while playing Call of Duty Modern Warfare 3? 

If YES then you have come to the right place. Before I teach you how to fix it, let me tell you that you are not alone who is getting this error on COD Modern Warfare 3. 

Since this error is preventing players from enjoying the game on their devices, a lot of players have been searching for fixes. 

With that in mind, we have come up with a couple of tweaks that will help you fix this error in Call of Duty Modern Warfare 3.

How to Fix Call of Duty Modern Warfare 3 Error “Your Operating System Windows 8/7 Is Not Supported”

Here are some ways that can be used to resolve the issue: 

Update To The Latest Version Of Windows :

You must know that Call of Duty Modern Warfare 3 requires the latest Windows 10 or above to run.

So if you are facing the error “Unsupported Operating System”, it is likely that your operating system is outdated. 

In that case, you need to update your Windows to the latest version. 

To do so, go to Settings > Windows Update > type Windows Update in the search bar.

Unsupported operating system’ error

Check if there is any Update Available for your Windows.

If Yes then click on Download and Install. Doing this will download and update your Windows to the latest version.

Once updated, launch the game and check if the error remains. 

Make Sure Your Game Is Not Running In Compatibility Mode: 

Many users reported that they were getting the same error despite having Windows 10 or the latest version installed on their devices. 

Notably, the latest version of Windows 11 is 22H2 and Windows 10 is 21H1.

If your Windows is updated but you continue to get the error message “Unsupported Operating System” then make sure to disable the Compatibility Mode.

Turn off Compatibility Mode For Steam:

To disable the compatibility mode for Steam, you need to follow the steps written below: 

  • Close the Steam Completely.
  • Now, click on the Steam icon and select Properties
  • Go to the “Compatibility” Tab.
Unsupported operating system’ error
  • Make sure to uncheck “Run this program in compatibility mode” 
  • Click on “Apply” and then click on Ok
  • That’s it. 

Turn off the Compatibility Mode For the Game:

To turn off the compatibility mode for the Game, follow the steps written below: 

  • Open Steam and then go to the Library
  • Right-click on the MW 3 Icon and go to Manage
  • Select the “Browse local files” option.
  • This will take you to the installation path of Call of Duty Modern Warfare 3.
Unsupported operating system’ error
  • Find “cod.exe” and then right-click on it and select “Properties”.
  • Go to the “Compatibility” Tab.
  • Uncheck “Run this program in compatibility mode”.
  • Click on “Apply” and then OK.
  • Now launch your game and then check if the error is gone. 

These are some solutions that could fix the Unsupported Operating System Problem on your Windows 7/8.

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