Software & Apps Windows How to Fix Ksuser.dll Not Found or Missing Errors A Troubleshooting Guide for Ksuser.dll Errors Share Pin Email Print Kmuser.dll Error. Windows The Ultimate Laptop Buying Guide 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 February 22, 2019 Ksuser.dll issues are caused in one way or another by an issue with Microsoft DirectX. The ksuser.dll file is one of many files contained in the DirectX software collection. Since DirectX is utilized by most Windows based games and advanced graphics programs, ksuser.dll errors usually show up only when using these programs. There are several ways that ksuser.dll errors can show up on your computer. Here are several of the more common ksuser.dll error messages you might see: The file ksuser.dll is missingKsuser.DLL Not FoundFile ksuser.dll not foundKsuser.dll not found. Reinstalling might help fix this. Ksuser.dll errors could apply to any program that utilizes Microsoft DirectX, most commonly video games. The DLL error usually appears when the program starts up. Any of Microsoft's operating systems since Windows 98 may be affected by ksuser.dll and other DirectX issues. This includes Windows 10, Windows 8, Windows 7, Windows Vista, Windows XP, and Windows 2000. How to Fix Ksuser.dll Errors Do not download the ksuser.dll DLL file individually from any "DLL download site." There are a number of excellent reasons that downloading DLLs from these sites are never a good idea. If you've already downloaded ksuser.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 ksuser.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 ksuser.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.Windows 7, 8, 10, Vista, XP, etc. are all supported by this same DirectX installation package. It will install any DirectX 11, DirectX 10, or DirectX 9 file needed and supported in that version of Windows.Assuming the latest DirectX version from Microsoft doesn't fix the ksuser.dll error you're receiving, look for a DirectX installation program on your game or application CD or DVD. Usually, if a game or other 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.Uninstall the game or software program and then reinstall it again. Something might have happened to the program files that work with ksuser.dll and a reinstall could do the trick.Restore the ksuser.dll file from the latest DirectX software package. If the above troubleshooting steps haven't worked to solve your ksuser.dll error, try extracting the ksuser.dll individually from the DirectX downloadable package.Update the drivers for your sound or video card. While it's not the most common solution, in some situations updating the drivers for the video card or sound card in your computer could correct this DirectX issue. Need More Help? If you're not interested in fixing 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.