If Siege X doesn’t launch on Steam, Ubisoft Connect, or another platform, you've got a little bit of troubleshooting work to do. Thankfully, most of the solutions shown below will work for any platform that you have Siege X installed on. Just make sure that you work your way through them and don't skip any that apply to your platforms and Windows in general.

Takeaways:

  1. Learn how to fix Rainbow Six Siege X Crashing on Ubisoft Connect
  2. Learn how to fix Rainbow Six Siege X Crashing on Steam
  3. Learn how to fix Rainbow Six Siege X Crashing on Epic

How to Fix Rainbow Six Siege X Crashing or Not Launching

Before you start any of the steps shown below, make sure that your system BIOS is fully up to date, as well as Windows. Once you have done that, clean install your GPU drivers using DDU.

  • Download Display Driver Uninstaller (DDU).
  • Grab the recommended stable NVIDIA driver (December 2024 or similar).
  • Disconnect from the internet.
  • Run DDU to fully uninstall your graphics drivers.
  • Reboot your PC.
  • Install the older driver manually.
  • Reboot again before reconnecting to the internet.

Reinstall BattlEye Anti-Cheat

This works for both Steam and Ubisoft

  • Open the game folder
  • Go to the BattlEye subfolder
  • Run Uninstall_BattlEye and confirm
  • Then run Install_BattlEye

This works quite a lot of the time so don't skip it.

Verify Game Files

  • In Steam: Right-click game > Properties > Installed Files > Verify

How to Fix Siege X Not Launching or Crashing

  • In Ubisoft Connect: Go to game > Three dots > Manage > Verify files

This checks for missing or corrupt files.

Repair Visual C++ Runtimes

This is one of those really random but important things some games have, which people overlook, so do the following.

  • Go to Support > Redist > VCRedist
  • Run installers for:
     - Visual C++ 2010
     - Visual C++ 2012
     - Visual C++ 2015–2022

Click Repair or Install when prompted.

Alternatively, you can use a bulk installer like this one. It will install all of the available versions and save you a fair bit of time.

Turn Off Steam Beta (if using Steam)

  • Open Steam
  • Go to Settings > Interface
  • Under Client Beta Participation, set to “No beta chosen”
  • Restart Steam

This prevents issues caused by unstable client builds.

Disable Third-Party Overlays

Turn off all overlays before launching the game:

  • Discord
  • MSI Afterburner
  • RivaTuner
  • GeForce Experience
  • NVIDIA APP
  • Steam

Restart your PC after disabling them.

Do Not Alt+Tab During Launch

Alt+Tabbing while the game loads can cause it to crash. Wait until the main menu appears before switching windows.

Reset Game Settings

  • Open File Explorer
  • Go to Documents > My Games > Rainbow Six Siege
  • Open the folder with your Steam or Ubisoft ID
  • Delete GameSettings.ini

This resets your graphics and input settings.

Try Launching from Ubisoft Connect

If you own the game on Steam:

  • Open Ubisoft Connect
  • Go to your Library
  • Click Play on Siege X

This bypasses Steam integration, which may be the problem.

Set DirectX Mode

  • In launch options (Steam or Ubisoft), enter -dx11 or -dx12
  • You can also try removing the argument to let the game choose

Switching modes can fix compatibility issues with certain GPUs or drivers. dx11 works best on some older PCs

Fix Siege X Not Launching or Crashing