How to Repair “D3dx9_39.dll is Missing” Problem in Windows PC

If you get interrupted by an error message when trying to start a game, it can be very annoying. But if the game application refuses to start, the cause may be deeper. Examine the error message carefully, and you’ll find the cause.

For example, if you get an error message like “The program cannot be started because d3dx9_39.dll is missing on your computer. Try reinstalling the program to solve this problem.” The solution is to reinstall the program. But sometimes this doesn’t solve the problem, so we offer you other solutions for missing d3dx9_39 error.

What causes ‘d3dx9_39.dll missing’?

The “missing d3dx9_39.dll” error usually occurs when you try to run games like League of Legends, Warhammer, etc. 3dx9_39.dll error may be caused by program malfunction, damaged or missing d3dx9_39.dll file, malware, etc.

If you are getting error messages such as d3dx9_39.dll not found or d3dx9_39.dll file is missing, you can refer to the following solutions.

How to solve the “d3dx9_39.dll is missing” problem?

Update Windows

  1. Open the Start menu.
  2. Open Windows Settings by selecting the Settings option.
  3. Select the Update and security option.
  4. Under Windows Update, find the Check for Updates tab.
  5. Click on it.

Update video card drivers manually

  1. Go to the Windows search box and search for Driver Manager.
  2. Open the Driver Manager.
  3. In Device Manager, go to Display Adapters.
  4. Select it and expand it.
  5. Find your video card driver and right-click on it.
  6. Click on the Update driver option.
  7. Select “Automatically check for updated drivers” in response to the question about how to check for driver updates.
  8. Allow the operating system to find the appropriate update for the video card driver.
  9. Once Windows has downloaded and installed the latest driver on your computer, restart it.

Install the appropriate program again

  1. Open the Windows Control Panel using the Windows search box.
  2. Move “Browse by” to the category.
  3. Under Programs, select Uninstall a program.
  4. Right-click on League of Legends or any other program you want to reinstall.
  5. Select Uninstall and follow the instructions.
  6. Correctly reinstall the software after uninstalling.

Reboot your Windows computer

If the problem is related to d3dx9_39.dll, you should first reboot your computer with Windows. This may be a temporary problem. Therefore, we recommend everyone who encounters this problem to reboot the system. After restarting your computer, try opening the application or game that caused the error again. Check if the problem with the missing d3dx9_39.dll persists.

Frequently Asked Questions

A DLL error can occur if your system's graphics driver is damaged or outdated. In this case, updating or reinstalling the graphics driver can solve the problem. Update Windows and the drivers (especially the graphics card driver) to the latest version. Then check if the DLL problem is resolved.

  1. Reboot your computer.
  2. Extract deleted DLL file from trash.
  3. Recover deleted DLL file with free file recovery program.
  4. Run a system-wide virus/malware scan.
  5. Use system restore to undo recent changes to the system.

  1. Reboot your computer.
  2. Recover deleted DLL file from trash.
  3. Recover deleted DLL file using free file recovery program.
  4. Run a system-wide virus/malware scan.
  5. Use System Restore to undo recent changes to the system.