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How to Fix Rainbow Six Siege Error Code 8 (0x00003700) on Windows 11: Step-by-Step Solutions

Rainbow Six Siege is a popular tactical shooter enjoyed by many players worldwide. However, encountering error codes like 8 (0x00003700) can disrupt your gaming experience. This error often prevents the game from launching or connecting properly on Windows 11.

Fixing this issue might seem complicated, but with a few clear steps, you can get back to playing without hassle. This guide will walk you through simple and effective solutions to resolve the error code 8 on your PC.

Each step is explained in detail to help even beginners understand what to do and why it matters. Follow the instructions carefully for the best results.

Let’s get started with some quick checks before moving to the troubleshooting steps.

Quick Note: Prerequisites and Initial Checks

  • Check your internet connection: A stable connection is essential for Rainbow Six Siege to run smoothly. Make sure you are connected to the internet and the connection is stable.
  • Restart your PC: Sometimes, a simple restart clears temporary issues affecting your game.
  • Update Windows 11: Running the latest Windows updates ensures compatibility and fixes known bugs.
  • Verify game files: Corrupted or missing files can cause errors. We will cover this in detail later.

Step 1: Run Rainbow Six Siege as Administrator

Running the game with administrative rights can solve permission-related issues that cause error code 8. Here is how you do it:

  1. Right-click on the Rainbow Six Siege shortcut or executable file.
  2. Select Properties from the context menu.
  3. Go to the Compatibility tab.
  4. Check the box that says Run this program as an administrator.
  5. Click Apply, then OK.
  6. Launch the game again and see if the error persists.

Why this matters: Running as administrator allows the game to access all necessary system files and settings without restrictions.

Step 2: Verify Game Files Integrity

Game files can sometimes become corrupted or incomplete. Verifying and repairing these files can fix error code 8.

For Ubisoft Connect:

  1. Open the Ubisoft Connect launcher.
  2. Go to your game library and select Rainbow Six Siege.
  3. Click on the Properties option.
  4. Choose Verify files or Verify integrity of game files.
  5. Wait for the process to complete; it will automatically replace or repair damaged files.
  6. Try launching the game again.

For Steam Users:

  1. Open Steam and go to Library.
  2. Right-click on Rainbow Six Siege and select Properties.
  3. Go to the Local Files tab.
  4. Click Verify integrity of game files.
  5. Wait until Steam finishes checking and repairing files.
  6. Start the game and check if the error is resolved.

Why this matters: Verifying files ensures the game is complete and not missing critical components needed to run correctly.

Step 3: Update Graphics Drivers

Outdated or faulty graphics drivers can cause performance issues and errors in games.

  1. Press Windows + X and select Device Manager.
  2. Expand the Display adapters section.
  3. Right-click your graphics card and choose Update driver.
  4. Select Search automatically for drivers to let Windows find the latest update.
  5. If no updates are found, visit the official website of your graphics card manufacturer (NVIDIA, AMD, Intel) to download and install the latest drivers manually.
  6. Restart your PC after updating drivers.
  7. Launch Rainbow Six Siege again.

Why this matters: Updated drivers improve game stability and fix compatibility problems with the latest Windows 11 updates.

Step 4: Disable Background Applications

Some applications running in the background may interfere with Rainbow Six Siege and cause error code 8.

  1. Press Ctrl + Shift + Esc to open Task Manager.
  2. Click on the Processes tab.
  3. Look for any unnecessary or resource-heavy apps like screen recorders, VPNs, or overlays.
  4. Select each of these apps and click End task.
  5. Try launching the game once the background apps are closed.

Alternative: You can perform a clean boot to start Windows with only essential services running. This helps rule out software conflicts.

Step 5: Adjust Firewall and Antivirus Settings

Your firewall or antivirus software might block Rainbow Six Siege from connecting to its servers, triggering the error code 8.

  1. Open Windows Security from the Start menu.
  2. Go to Firewall & network protection.
  3. Click on Allow an app through firewall.
  4. Find Rainbow Six Siege in the list, and make sure both Private and Public checkboxes are selected.
  5. If it’s not listed, click Allow another app and add the game’s executable file.
  6. Also, temporarily disable third-party antivirus software and check if the game launches without errors.
  7. Remember to re-enable antivirus protection after testing.

Why this matters: Proper firewall configuration ensures the game can communicate with Ubisoft servers without interference.

Step 6: Reinstall Rainbow Six Siege

If none of the above solutions work, reinstalling the game can fix deeper issues related to corrupted installations.

  1. Open Ubisoft Connect or Steam.
  2. Uninstall Rainbow Six Siege from your library.
  3. Restart your computer once the uninstall is complete.
  4. Download and install the game again from the official source.
  5. Launch the game and check if the error code 8 is resolved.

Why this matters: A fresh installation replaces all game files and settings, eliminating any hidden corruption or misconfiguration.

Frequently Asked Questions (FAQs)

What causes Rainbow Six Siege Error Code 8 (0x00003700)?

This error usually occurs due to corrupted game files, permission issues, outdated drivers, or conflicts with security software.

Can Windows 11 compatibility cause this error?

While Windows 11 is generally compatible, some outdated drivers or software conflicts can cause problems. Keeping your system updated helps prevent such errors.

Do I need a strong internet connection to avoid this error?

Yes, Rainbow Six Siege requires a stable internet connection for multiplayer and server communications. Network interruptions can trigger error code 8.

Is it safe to disable antivirus when playing?

Temporarily disabling antivirus can help test if it’s causing issues, but always re-enable it afterward to keep your PC protected.

Will updating Ubisoft Connect or Steam help?

Yes, keeping game launchers updated ensures better compatibility and fewer errors.

When Nothing Works

If you’ve tried all the steps above and the error code 8 still appears, consider these final options:

  • Contact Ubisoft Support: Visit https://www.ubisoft.com/help for official troubleshooting and support.
  • Check Ubisoft Forums: Search community discussions for similar issues and solutions.
  • Perform a System Restore: If the problem started recently, restoring your system to an earlier point might help.
  • Reinstall Windows: As a last resort, a clean Windows installation can fix deep system issues, but backup your data first.

Conclusion

Error code 8 (0x00003700) in Rainbow Six Siege on Windows 11 can be frustrating, but most players can fix it by following a few straightforward steps. Starting from running the game as administrator to verifying game files and updating drivers addresses the most common causes. Adjusting firewall settings and disabling conflicting background apps also helps ensure smooth gameplay.

If problems persist, reinstalling the game or seeking official support offers further assistance. Keeping your system and software updated is key to preventing future errors. By following this guide carefully, you should be able to resolve the error and enjoy Rainbow Six Siege once again.

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