d3dx9_43.dll is missing the DLL file and cannot enter the game. When running a game that requires DX9 support on Windows 10/11, it will prompt that the DLL file is missing, resulting in the inability to run the game. You can download the DirectX End-User Runtime Web Installer from Microsoft's official website to solve the problem of being unable to enter the game. The following will teach you how to solve the problem of missing DLL files and being unable to enter the game.