After restarting, check that your DirectX installation is working properly by running the game or application that initially caused the “d3dx9_43.dll missing” error. Once the DISM and SFC tools are finished, close PowerShell and restart your PC. To do this, right-click the Start menu and select Settings.If it can’t run, check Windows Update for updates first. The latest games require the latest versions of DirectX. However, with new DirectX updates and releases, your PC may become outdated. With the release of Windows 10, DirectX is now a core Windows component, so you shouldn’t need to install it manually to play your games. If your DirectX files are corrupted (and Windows Update can’t repair the issue), however, you may need to use system repair tools, such as SFC and DISM, to fix the problem. To install legacy DirectX files for older games, you can use the DirectX End-User Runtime Installer to fix any issues.

To update DirectX and install the latest version, you’ll need to use Windows Update. It can also occur for older games that require older versions of DirectX (such as Direct X 9, 10, etc), which Windows 10 may no longer support directly. For example, if you have DirectX 11 installed, but your game requires DirectX 12, you may see this error or similar errors, such as a dxgmms2.sys BSOD, appear.

Reinstalling directx 12