The file d3dx11_43.dll is one of many DLL files in the Microsoft DirectX software collection. Any problems with D3dx11_43.dll are therefore caused by a problem with DirectX in one way or another.
How to Fix D3DX11_43.dll Missing Error
Since DirectX is used by most Windows games and advanced graphics programs, d3dx11_43.dll errors usually only appear when using these programs.
Follow these steps in the order given to try the simpler solutions first.
Restart your computer if you haven't already. The d3dx11_43.dll error may be a fluke and a simple restart may fix it completely.
