Before diving into the fixes, it’s helpful to understand what might be causing this error:

Corrupted game files can occur during installation or updates.Outdated drivers, such as graphics drivers or the Windows OS, can lead to compatibility issues.Permissions issues may arise if the game requires administrative privileges to run correctly.A misconfiguration of a kernel-level driver used by Call of Duty’s anti-cheat system.

Now that we have a better understanding of this error, we can tackle it more efficiently without encountering too much hassle. Here are several methods you can try to fix the error:

1. Run the Game as an Administrator

Running the game with administrative privileges can resolve permission-related issues. This can prevent permission-related errors that might otherwise stop the game from launching properly.

2. Update Graphics Drivers

Outdated graphics drivers can lead to compatibility issues with newer games or updates. By updating your drivers, you ensure that your system can handle the graphics requirements of Call of Duty: Modern Warfare 3, reducing the likelihood of crashes or errors.

3. Reinstall Gaming Services

Gaming Services are essential for managing game installations and updates on Windows. If these services are not functioning correctly, reinstalling them can restore functionality, resolving any underlying issues that may cause errors during gameplay.

4. Perform a Clean Boot

A clean boot starts Windows with a minimal set of drivers and startup programs, which helps eliminate software conflicts that could be causing the error. This allows you to identify if any background applications are interfering with the game.

5. Run the Call of Duty Randgrid Service Setup Script

This script sets up a critical service required by Call of Duty’s anti-cheat system. Here’s how you can do this:

For Windows 11:

For Windows 10:

This script installs and configures a kernel-level driver used by Call of Duty’s anti-cheat system, which is crucial for preventing errors related to service registration. If you’ve tried all these methods and still encounter Error Code (0x1), it may be time to reach out to Activision support for further assistance. They may have additional insights or solutions specific to recent updates or issues with their servers. I hope this guide helps you get back into playing Call of Duty: Modern Warfare 3 without any interruptions! If you have any questions or need further assistance, feel free to ask.

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