How to Fix d3dx9_40.Dll Missing Error | SmartPCFixer Official Blog

What is d3dx9_40.Dll?

Dynamic-link library or DLL, is Microsoft’s implementation of the shared library concept in the Microsoft Windows and OS/2 operating systems. These libraries usually have the file extension DLL, OCX (for libraries including ActiveX controls), or DRV (for legacy system drivers). The file formats for DLLs are the same as for Windows EXE files — that is, Portable Executable (PE) for 32-bit and 64-bit Windows, and New Executable (NE) for 16-bit Windows. As with EXEs, DLLs can contain code, data, and resources, in any combination.

D3dx9_40.Dll errors often appear while you are running programs that associated with Microsoft DirectX.

These are some common error messages we get about d3dx9_40.Dll.

“D3DX9_40.DLL Not Found.”
“D3dx9_40.Dll not found. Reinstalling might help fix this.”
“File d3dx9_40.Dll not found.”
“The file d3dx9_40.Dll is missing.”

Why does D3dx9_40.Dll Errors occur?

D3dx9_40.Dll issues are caused in one way or another by an issue with Microsoft DirectX.

The d3dx9_40.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, d3dx9_40.Dll errors usually show up only when using these programs.

Method A:

Smartpcfixer can help you to fix this problem:

You can follow the instructions below to fix it manually:

Download the dll:

http://www.dll-files.com/d3dx9_40.zip?0WHfSDVHjX

Save to :

c:\windows\system32

Then use Smartpcfixer to register the dll:

Please download by below url:

http://www.smartpcfixer.com/

How to re-register dll by Smartpcfixer:

Run Smartpcfixer, click ‘system fix’ -> activex register
Then click’re-register’ button.

Method B:

If you couldn’t fix the problem by above solutions, you could try this one:

You can run sfc to see whether the system files are corrupted, and it will fix dll problems automatically:

How to run sfc by administrator on windows 7 /vista:

Go to Start / All Programs / Accessories.
Right click the Command Prompt item and select the ‘Run As Administrator’ option.
Click Continue on the UAC prompt.
In the command prompt window, type the following command.
SFC /SCANNOW
Press ENTER.
(Make sure the command is entered exactly as shown, including the space)

It will take a few minutes to run. Please do not use the computer while it is running.
After it is finished, exit any running programs and reboot the computer.

Method C:

You can also do it by yourself.

How to install and uninstall d3dx9_40.Dll file?

Press Start and select Run
Type CMD and press Enter (or if you use Windows ME, type COMMAND)
Type regsvr32 d3dx9_40.Dll and press Enter
To install the dll files, type: regsvr32 d3dx9_40.Dll
To uninstall the dll files, type: regsvr32 -u d3dx9_40.Dll

In the end, you should receive a message saying that your file was successfully installed or uninstalled.

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