D3dx9_42.dll is missing on Windows 10 [QUICK FIX]

Aleksandar Ognjanovic
by Aleksandar Ognjanovic
Troubleshooting Expert
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  • This exact DLL file belongs to DirectX, a bundle of different applications linked to multimedia and game programming. 
  • Firstly, we strongly advise you to avoid DLL-download websites. Some of them might indeed provide proper DLL files, but the risk of malware is too high.
  • Go to our Fix DLL errors in Windows 10 section and you will find plenty of solutions for the DLL problems.
  • If you're interested in solving a Windows 10 general error,  the Windows 10 errors hub is for you.
How to fix D3dx9_42.dll is missing on Windows 10
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More than a few users run into this or similar problems, especially avid gamers.

They try to start the application or, let’s say a game of some kind, and they’re suddenly prompted with D3dx9_42.dll is missing error in Windows 10.

Even though it looks scary, there’s nothing to worry about.

This is one of many DirectX errors that are quite common for all iterations of the Windows platform, including Windows 10.

So, in case you run into it, make sure to check the solutions below.

How can I fix DirectX error D3dx9_42.dll is missing in Windows 10?

  1. Install DirectX
  2. Reinstall the problematic program or game
  3. Check your GPU drivers

Solution 1 – Install DirectX

This exact DLL file belongs to DirectX. As you might know, DirectX is a bundle of different applications linked to multimedia and game programming.

Without DirectX, you’ll be unable to run any game on the Windows shell.

And that’s exactly why you’re prompted with this error. One of the essential DirectX files is missing from the System32 folder and you’ll need to get it back where it belongs.

Firstly, we strongly advise you to avoid DLL-download websites. Avoid them like plague. Some of them might indeed provide proper DLL files, but the risk of malware is too high.

Now, if there’s one Windows game-related redistributable that can be found everywhere, it’s DirectX.

You can navigate to the installation setup of any given game you have in your possession and it should be there.

From there, just run the installer and update DirectX. You can aim for the latest version, but that’s not of immense importance. Any DirectX is better than none.

Otherwise, you can download DirectX from the official Microsoft site.d3dx9_43.dll is missing

If this does not solve your issue, we recommend using a 3rd party software.

Run a third-party DLL fixer

There are plenty of third-party programs out there that promise to fix or replace missing or broken DLLs, and most of them stay true to their word. However, if you are to choose just one, then there’s no way you can go wrong with Restoro.

How to use Restoro to fix missing or broken DLLs

  1. Download here Restoro and install it on your Windows 10 PC
  2. Let Restoro perform a full system scan
  3. When the scan is finished, press Clean Now
    • This is when you will have to activate your license key
    • Before the repair process starts, Restoro will create a restore point of your system in case things go wrong
  4. Restoro will now proceed to fix your DLL-related issue.

Note: While Restoro can be downloaded for free, it has limited functionality until you activate it. That being the case, if you want the full benefit of a great PC repair and optimization tool, you should purchase the full license.

Solution 2 – Reinstall the problematic program or game

Sometimes, the problem may lie in the game or application you’re running, rather than in DirectX.

Such complex programs can easily get corrupted or can suffer from repetitive incomplete files.

On top of that, if we assume that other games or applications are working, it’s simple to conclude what’s the culprit.

In addition, before we move to a complete reinstallation segment, it’s worth mentioning that certain game desktop clients, like Steam or Origin, offer the integrity checking tool.

With this tool, you can check for the integrity of the installation files and fix the possible corruption.

On the other hand, if that’s taking you nowhere, the reinstallation should be your next step. Follow the instructions below to reinstall the affected program or game.

  1. In the Windows Search bar, type control and open Control Panel.
  2. Choose Uninstall a program.
  3. Right-click the troubling program or game and uninstall it. Before that, you might want to backup your saves.
  4. Now, navigate to the installation and AppData folders, and clear all remaining files.
  5. Start the setup and install the program again and look for changes.

Solution 3 – Check GPU drivers

Finally, if both of the aforementioned solutions were futile, all our suspicion gets redirected to drivers.

The outdated or unsuitable GPU drivers can also provoke this or similar errors.

They are directly related to DirectX and the functionality of all related applications heavily depend on the GPU properly doing its job.

For more information on how to update your graphics drivers, check out this guide.


Fix''D3dx9_42.dll is missing'' in Windows 10 (1)

Most of the time, the generic GPU drivers provided via Windows Update won’t suffice. So, in order to get the proper drivers, you’ll need to look at the OEM’s official site.

These are the links to three major manufacturers. Once there, you’ll have the easy time locating and downloading the proper drivers.

In the end, after you install the proper drivers, restart your PC , and run the program again.

We hope that this was a helpful read and that, with the included steps, you’ll be able to overcome the D3dx9_42.dll is missing error.

In case you have questions, suggestions , or remarks, make sure to post them in the comments below. We look forward to your feedback.

FAQ: Read more about D3dx9_42.dll

  • What is D3DX9_42.dll?

D3DX9_42.dll is a DLL file developed by Microsoft, which is referred to as an essential system file associated with DirectX. If you have problems installing DirectX on Windows 10, we can help you with this awesome guide.

  • What is D3DX9_42.dll used for?

D3DX9_42.dll file is also known as Direct3D 9 Extensions and it is associated with Microsoft DirectX for Windows.

  • How can I fix D3DX9_42.dll is missing error?

D3dx9_42.dll is missing error message is usually caused by an application. Follow our full, step-by-step guide on how to fix the D3DX9_42.dll error.

Editor’s Note: This post was originally published in September 2018 and has been since revamped and updated in March 2020 for freshness, accuracy, and comprehensiveness.

Editor's Note: This article was originally published in September 2017 and was revamped and updated in November 2020 for freshness, accuracy, and comprehensiveness.
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