Fix: COD Modern Warfare 2 Full Screen Not Working

Infinity Ward and Activision have recently launched the all-new Call of Duty: Modern Warfare II for the COD fans to experience the multiplayer FPS title with the return of the iconic Operators of Task Force 141. As a direct sequel to 2019’s Modern Warfare, it’s doing well in terms of graphics & performance. However, there are a few flaws that should be fixed. Meanwhile, the COD Modern Warfare 2 Full Screen Not Working issue is troubling a lot of players.

Now, if you’re also one of the victims of such an issue, you can follow this troubleshooting guide to resolve it. According to several reports, the Call of Duty MWII game is not launching in full-screen mode by default on the Windows PC, which becomes quite frustrating. It seems pretty disappointing for the affected players while launching the game due to several possible reasons you should check. Luckily, some workarounds can fix it quickly.

Fix: COD Modern Warfare 2 Full Screen Not Working

Fix: COD Modern Warfare 2 Full Screen Not Working

Let’s take a quick look at the reasons. The chances are high that outdated graphics drivers, an outdated system version, an outdated game version, issues with the antivirus or firewall program, corrupted or missing game files, conflict with the admin access while launching the game, or in-game graphics settings conflict, etc., can trouble. So, it’s highly recommended to follow the troubleshooting methods below. Now, without further ado, let’s jump into it.

1. Run the game as an Administrator

First, you should try running the game exe application file on your PC as an administrator to ensure there is no conflict with the user account control (UAC) access on the system. If, in case, your game file isn’t running with the admin access, it may cause launching issues on the Windows PC. To give admin access:

  • Right-click on the Call of Duty: MWII application file on your PC.
  • Click on Properties > Click on the Compatibility tab.
  • Make sure to tick mark the Run this program as an administrator checkbox to enable it.
  • Click on Apply and then OK to save changes.
  • Once done, you can launch COD: MW2 again to check for the issue.

2. Adjust In-Game Graphics Settings

You can also change the in-game graphics settings to check whether the problem still appears. Some in-game graphics settings may help you play the game better and achieve a higher framerates count apart from fixing the fullscreen not working issue. Head over to the COD Modern Warfare II graphics menu and follow the settings or tweaks below to check for the issue.

  • Display Adaptor: Select your graphics card
  • Screen Refresh Rate: Refresh rate of your monitor
  • Display Resolution: Native resolution of the monitor
  • Aspect Ratio: Automatic

3. Close Background Running Tasks

In some cases, unnecessary background running tasks or programs can consume many system resources like CPU or Memory usage. To do that:

  • Press the Ctrl+Shift+Esc keys to open up Task Manager.
  • Now, click on the Processes tab.
  • Click to select a task unnecessarily running in the background and consuming enough system resources.
  • Click on End Task to close them one by one.
  • Once done, restart your system.

4. Update COD Modern Warfare II

Installing the latest update of the game version is highly recommended to ensure the game can run properly. You should follow the steps below to update the game.

For Steam:

  • Open the Steam client > Go to Library.
  • Click on COD Modern Warfare II from the list of installed games on the left pane.
  • Now, the client will automatically search for the available update.
  • If an update is available, you’ll see the Update option > click on it.
  • Wait for a couple of minutes or so until the game update completes. [Depends on the storage space and internet connectivity]
  • Once done, make sure to close the Steam client.
  • Finally, reboot your PC to apply changes, and launch the COD Modern Warfare 2 game again.


  • Open the (Blizzard) launcher.
  • Click on the Blizzard logo from the top left corner.
  • Go to Settings > Click on Game Install/Update.
  • Click on Apply latest updates and download future patch data for recently played games to enable it.
  • Now, click on Done to save changes > Restart the launcher to apply changes.
  • It should automatically update the game to the available version.

5. Repair and Verify Game Files

Sometimes corrupted or missing game files on the PC may trigger some issues with the game launching or running smoothly. Make sure to verify the game files and repair them via the Steam or client by following the steps below:

For Steam:

  • Open the Steam client on the PC and log into the account > Head over to Library.
  • Right-click on the COD Modern Warfare II game from the left pane.
  • Click on Properties > Click on the Local Files tab.
  • Then click on Verify Integrity of game files…
  • Now, wait for the process to complete, and close the Steam client.
  • Finally, restart the PC to apply changes.


  • Open the client on your PC.
  • Click on the Call of Duty: Modern Warfare II game.
  • Now, click on OPTIONS (Gear icon) > Click on Scan and Repair.
  • Choose Begin Scan and wait for the process to complete.
  • Once done, close the launcher, and restart your PC.

6. Update GPU Drivers

An outdated or corrupted graphics card driver can trigger multiple game or system performance issues while running programs. It’s highly recommended to check the graphics driver update. To do so:

  • Press the Win+X keys to open the Quick Link Menu.
  • Click on Device Manager from the list > Double-click on Display adapters.
  • Right-click on the dedicated graphics card that you’re currently using.

Device Manager Update Display Adapter

  • Click on Update driver > Choose Search automatically for drivers.
  • If there is the latest update available, it’ll automatically download & install the latest version.
  • Once done, restart the computer to apply changes immediately.

Alternatively, you can manually download the latest version of the graphics driver and install it on the PC via the official website. Make sure to download the graphics driver file respective to your graphics card model and manufacturer. Nvidia graphics card users can update the GeForce Experience app via the Nvidia official site and AMD graphics card users can visit the AMD website for the same. While Intel graphics users can visit here.

7. Disable Antivirus Protection

If in case, your PC applications or the games not running properly on your PC then the chances are high that there is a conflict with the security software. An aggressive antivirus program can prevent ongoing files to reduce vulnerability issues on the system. But you can manually disable the antivirus protection to check for the issue. To do that:

  • Press the Win+I keys to open Windows Settings.
  • Click on Update & Security > Click on Windows Security from the left pane.Windows Security
  • Go to Virus & threat protection > Click on Manage settings.
  • You’ll have to turn off the Real-time protection toggle.Real-time protection
  • If prompted, click on Yes to proceed further.

That’s it, guys. We assume this guide was helpful to you. For further queries, you can comment below.

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