d3dx9_43.dll missing error is the common Windows problem you may encounter when you start a program or launch games.  Why would it happen? In fact, dll files are in the DirectX software collection, working the same as exe files, except that they are shared by programs. Windows will load the dll files when you start a specific program. But if the loading fails, you’ll receive the error message. d3dx9_43.dll missing problem is one of such case.

In the post here are top solutions that you can use to fix the problems.

Solution 1 Check up your PC

Download and run Neptune SystemCare Ultimate/Premier to scan and fix the problems that might have an influence on d3dx9_43.dll missing error.

Solution 2 Restart your computer 

Restarting your computer could be one of the best and easiest way to solve most system dysfunction problems.

Solution 3 Download and install the latest version of DirectX

Updating to the latest version of DirectX will fix the d3dx9_43.dll not found error sometimes. Here’s one way to find out what version of DirectX you have now so that you can upgrade to a new one：

Press Win+R to open the Run command. Type dxdiag in the box and press enter.

Solution 4 Update your graphics driver

Actually d3dx9_43.dll missing or not found is mostly related to the graphics driver. To update your graphics driver, you could:

1. ->Go to Device Manager by right-clicking on the start button and choose Device Manager.

2. ->Expand the graphics hardware and right-click on it to choose Update Driver Software.