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On a Windows 7 (6.1.7601) 32-bit system, Microsoft Word 2010 experienced astounding 55% increase in startup load time after using Reginout in the test we ran. *


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Transcoding and Video playback experienced more than 100% speed gains when using Reginout.*



  • Remove DirectX from your system to fix D3dx9_43.dll
  • Remove DirectX from Registry to fix error D3dx9_43.dll
  • Uninstall the Program causing Error
  • Download Latest Version of DirectX
  • Run System File Checker
  • Repair Windows Registry

Remove DirectX from your system to fix D3dx9_43.dll

Windows operating system automatically installs DirectX when you start your system. As, d3dx9_43.dll missing error appears when there is problem with version of DirectX installed on your system. Prevent Windows from automatically loading DirectX. Follow the steps given below to do so.

  • Open Start | Now right-click on Computer
  • Select Properties from drop-down
  • Click on System Protection from System Properties
  • Now click on C:Drive from Protection Settings | Now click on Configure
  • Now click on Turn Off System Protection | OK
  • Restart your system

Remove DirectX from Registry to fix error D3dx9_43.dll

After preventing Windows from loading DirectX automatically, try removing DirectX from Windows Registry. Follow the procedure given below to remove DirectX from Registry.

  • Click on Start
  • Type “Run” in Search Box
  • Right-click on Run to Run as Administrator
  • In Run box type “REGEDIT” and press OK
  • In the Registry Editor GOTO following Registry Key
    HKEY_LOCAL_MACHINE\Software\Microsoft\DirectX
  • Remove this Registry Key
  • Exit from Registry Editor
  • Restart your system

Uninstall the program causing Error

Try uninstalling the program that is causing d3dx9_43.dll error. To uninstall the program, follow the instructions given below.

  • Click on Start | Select Control Panel
  • Click on Uninstall a Program under Programs in Control Panel
  • Select the Program that is causing Error
  • Uninstall it
  • Follow on-screen Wizard

Download Latest Version of DirectX

d3dx9_43.dll  error can be fixed by downloading latest version of DirectX. Follow the steps given below to download latest version of DirectX.

  • Open your browser
  • Download latest version of DirectX from Microsoft Downloads
  • Restart your system

Run System File Checker

System File Checker is built-in utility that scans and repair system file errors. d3dx9_43.dll can be fixed by running system file checker. Follow the procedure given below to run System File Checker.

  • Open Start
  • Type “Run” in Search box
  • Type”sfc /scanNow” without quotes and press Enter

Repair Windows Registry

Corruption in Windows Registry can cause various errors. Try repairing Windows Registry to fix d3dx9_43.dll. Here is procedure to fix Windows Registry.

  • Download and Install System Utility Software such as RegInOut
  • Click on Registry Repair feature
  • Scan your system file Registry Errors | Fix errors
  • Close RegInOut Editor