Software & Apps Windows How to Fix D3dx9_39.dll Not Found or Missing Errors A troubleshooting guide for D3dx9_39.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 November 18, 2019 Windows The Ultimate Laptop Buying Guide Tweet Share Email The d3dx9_39.dll file is one of many files contained in the Microsoft DirectX software collection. This means that d3dx9_39.dll issues are caused in one way or another by an issue with Microsoft DirectX. Since DirectX is utilized by most Windows based games and advanced graphics programs, d3dx9_39.dll errors usually show up only when using these programs. There are several ways that d3dx9_39.dll errors can show up on your computer. Some of the more common specific d3dx9_39.dll error messages are listed below. D3DX9_39.DLL Not FoundD3dx9_39.dll not found. Reinstalling might help fix thisFile d3dx9_39.dll not foundThe file d3dx9_39.dll is missing The d3dx9_39.dll error message could apply to any program that utilizes Microsoft DirectX, but it usually applies to video games. The d3dx9_39.dll error might be seen when the program or game is first starting or at some point during the initial installation. Some common games that have been known to generate d3dx9_39.dll errors include Combat Arms, Evidyon: Project Volucris, League of Legends, Prince of Persia, Warhammer 40,000: Dawn of War, and more. Any of Microsoft's operating systems since Windows 98 may be affected by d3dx9_39.dll and other DirectX issues. This includes Windows 10, Windows 8, Windows 7, Windows Vista, Windows XP, and Windows 2000. How to Fix D3dx9_39.dll Errors Don't download the d3dx9_39.dll DLL file individually from any "DLL download site". There are a number of different reasons that downloading DLLs from these sites is never a good idea. If you've already downloaded d3dx9_39.dll from one of those DLL download sites, remove it from wherever you put it and continue with these steps. Restart your computer if you haven't yet. The d3dx9_39.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_39.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, Vista, XP, and more. It will replace any missing DirectX 11, DirectX 10, and DirectX 9 files. Assuming the latest DirectX version from Microsoft doesn't fix the d3dx9_39.dll error you're receiving, look for a DirectX installation program on your game or application CD or DVD. Usually, if a game or another program utilizes 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. The DirectX program you're looking for might be named dxsetup or something similar. One quick way to find it is to search the disc for it using a file search tool like Everything. 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_39.dll and a reinstall could do the trick. Sometimes, even after an uninstall, some files are left over that could still be causing issues that ultimately show a d3dx9_39.dll error message. Try a free uninstaller tool instead so that you can be sure that the entire program, and all of its related files, are deleted before reinstalling it. Restore the d3dx9_39.dll file from the latest DirectX package. If the above troubleshooting steps haven't worked to solve your d3dx9_39.dll error, try extracting the d3dx9_39.dll file individually from the DirectX installation 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 issue. Need More Help? If you don't want to fix this problem yourself, 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.