d3dcompiler_43.dll is associated with the Direct3D HLSL Compiler and the program Microsoft DirectX, it was developed by Microsoft Corporation. d3dcompiler_43.dll errors are most commonly caused when two programs share the same .dll file. When a program is deleted sometimes it will delete the .dll file associated with both programs. Errors can also occur from a faulty d3dcompiler_43.dll file or incorrect versions of the file.