Software & Apps Windows How to Fix D3dx9_43.dll Not Found or Missing Errors A troubleshooting guide for d3dx9_43.dll errors By Tim Fisher General Manager, VP, Lifewire.com Tim Fisher has 30+ years' professional technology support experience. He writes troubleshooting content and is the General Manager of Lifewire. our editorial process Facebook Twitter LinkedIn Tim Fisher Updated March 26, 2020 Windows The Ultimate Laptop Buying Guide Tweet Share Email D3dx9_43.dll errors arise from a problem with Microsoft DirectX. The d3dx9_43.dll file is one of many files contained in the DirectX software collection. Since DirectX is employed by most Windows based games and advanced graphics programs, d3dx9_43 DLL errors usually show up only when you use these programs. There are many ways d3dx9_43.dll errors can show up on your PC. Here are several of the more common specific d3dx9_43.dll error messages you might see: D3dx9_43.DLL Not FoundThe file d3dx9_43.dll is missingFile d3dx9_43.dll not foundD3dx9_43.dll not found. Reinstalling might help fix this. Any of Microsoft's operating systems since Windows 98 may be affected by d3dx9_43.dll and other DirectX errors. How to Fix D3dx9_43.dll Errors Do not download the d3dx9_43.dll DLL file individually from any "DLL download site." Downloading DLLs from these sites are never a good idea. If you've already downloaded d3dx9_43.dll from one of those DLL download sites, remove it from wherever you put it and continue with these steps. Start Windows in Safe Mode to complete any of the following steps if you're unable to access Windows normally due to the d3dx9_43.dll error. Restart your computer if you haven't yet. The d3dx9_43.dll error might be a fluke and a simple restart could clear it up completely. Install the latest version of Microsoft DirectX. Chances are, upgrading to the latest version of DirectX will fix the d3dx9_43.dll not found error. Microsoft often releases updates to DirectX without updating the version number or letter, so be sure to install the latest release even if your version is technically the same. The same DirectX installation program works with all versions of Windows including Windows 10, 8, 7, and Vista.. It replaces any missing DirectX 11, DirectX 10, or DirectX 9 file. Assuming the latest DirectX version from Microsoft doesn't fix the d3dx9_43.dll error you're receiving, look for a DirectX installation program on your game or application DVD or CD. Usually, if a game or other program uses DirectX, the software developers will include a copy of DirectX on the installation disc. Sometimes—though not often—the DirectX version included on the disc is a better fit for the program than the latest version available online. Uninstall the game or software program and then reinstall it again. Something might have happened to the files in the program that work with d3dx9_43.dll and a reinstall could do the trick. Restore the d3dx9_43.dll file from the latest DirectX software package. If the above troubleshooting steps haven't worked to solve your d3dx9_43.dll error, try extracting the d3dx9_43.dll individually from the DirectX downloadable package. Update the drivers for your video card. While it's not the most common solution, in some situations, updating the drivers for the video card in your computer could correct this DirectX glitch. Need More Help? If you're not interested in fixing this problem yourself, even with help, see How Do I Get My Computer Fixed? for a full list of your support options, plus help with everything along the way like figuring out repair costs, getting your files off, choosing a repair service, and a whole lot more.