Find the game's executable (usually GRFS.exe or FutureSoldier.exe ) in the game folder.

On Windows 10/11, check "Disable fullscreen optimizations" in the Compatibility tab to improve stability. Important Note on Online Services Guide :: How to get the game running on a modern PC

Navigate to your installation directory (usually C:\Program Files (x86)\Ubisoft\Ubisoft Game Launcher ) and delete the entire folder . Do not skip this, as residual files often cause the error to persist.

Open your system's "Add or Remove Programs" and uninstall the Ubisoft Game Launcher (now known as Ubisoft Connect).