How to Fix Unsupported Operating System in Call of Duty Modern Warfare 2

Are you getting a “Unsupported operating system” error in Call of Duty?

The error message can happen in Modern Warfare 2, Warzone 2, DMZ, and other modes.

Here’s the full error message, “Your operating system Windows 11 is not supported”.

Followed by “We recommend upgrading to Windows 10 version 1909 or newer”.

And, “Would you like to visit Activision Support for more information?”.

In this guide, you’ll learn how to fix the Unsupported Operating System error in Call of Duty Modern Warfare 2 (MW2).

Why is my operating system not supported in Call of Duty?

Your operating system is not supported in Call of Duty because you’re running the Windows Insider Program.

It can also be due to a compatibility mode issue or an outdated operating system.

The latest updates from the Windows Insider Program is not compatible with Call of Duty MW2.

If you recently updated Windows, the game will fail to launch and you’ll get an error message.

The error message will say that your operating system is not supported and you’ll have to upgrade it.

To fix Unsupported Operating System in Call of Duty Modern Warfare 2, you need to uninstall Windows Updates.

You can also try to uncheck compatibility mode or wait for Infinity Ward to fix the issue.

Search for “Check for updates” using Windows Search.
Select “Update History” followed by “Uninstall Updates”.
Uninstall all updates that have the word “Beta” or “Beta Channel Enablement” in them.
Restart your PC if necessary to successfully uninstall updates.
Launch Call of Duty and check if the error is fixed.

Right-click the Battle.net or Steam app and select “Properties”.
Select “Compatibility” and uncheck “Run this program in compatibility mode for”.
Locate and right click the Call of Duty app (e.g. MW2) and select “Properties”.
Select “Compatibility” and uncheck “Run this program in compatibility mode for”.
Launch Call of Duty and check if the error is fixed.

Note: If “Run this program in compatibility mode for” is already unchecked, try checking it instead.

Check the latest Call of Duty issues here: https://trello.com/b/mCqzSc7D/modern-warfare-ii-infinity-ward.
Open the issue that is related to the unsupported operating system error (e.g. Windows Insider Program issue).
Check the status of the issue by looking at its label (e.g. Investigating).