Xinput9_1_0.dll issues are caused by a missing or corrupt DirectX DLL file.
The xinput9_1_0.dll file is one of many files contained in DirectX. Since DirectX is utilized by most Windows-based games and advanced graphics programs, xinput9_1_0.dll errors usually show up only when using these programs.
[The following advice is courtesy of the good folks at pcsupport.about.com]
Important Note: Do not download the xinput9_1_0.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.
The first thing to try would be to install the latest version of Microsoft DirectX. Chances are, upgrading to the latest version of DirectX will fix the 'xinput9_1_0.dll not found' error.
Note: Windows 7, 8, 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.
- Uninstall the game or software program and then reinstall it again. Something might have happened to the program files that work with xinput9_1_0.dll and a reinstall could do the trick.
- Restore the xinput9_1_0.dll file from the latest DirectX software package. If the above troubleshooting steps haven't worked to solve your xinput9_1_0.dll error, try extracting the xinput9_1_0.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 issue.
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