Step1.
DownLoad Microsoft free tool Dependency Walker
It is View Dll Ref tool!
(http://www.dependencywalker.com/) or
VisualStudio Common7/Tools/ bin/Depends.Exe
Step2.
Run DW.
Open File libgfxunity3d.dll
Load Fail D3DX9_43.DLL !!
Step3.
DownLoad D3DX9_43.DLL(Search MSDN)
Step4.
Copy System32
Copy SysWOW64
Reboot!!
If you Windows8
Please Update Window.
It is Setup DX each version And Dll.
...
D3DX9_41.DLL
D3DX9_42.DLL
D3DX9_43.DLL
...
D3DX10_xx.DLL
...
D3DX11_xx.DLL