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Here's How to Fix D3DX9_39.dll Missing error on Windows. Run Avast Driver Updater@ https://www.anrdoezrs.net/click-7952654-14577796 to keep your device drivers up-to-date, easily & effectively.

The "D3DX9_39.dll missing" error occurs when the dynamic link library file for DirectX is missing or corrupted. Here are some steps you can take to fix the error on Windows:

1. Install DirectX: The easiest solution is to download and install the latest version of DirectX from the Microsoft website. This should include the missing D3DX9_39.dll file and resolve the issue.

2. Run a system file check: Open Command Prompt as an administrator and type "sfc /scannow" and press enter. This will scan your system files for any corrupted files and repair them if necessary.

3. Update drivers: Outdated or corrupted graphics card drivers can also cause the "D3DX9_39.dll missing" error. Try updating your graphics card drivers to the latest version.

4. Reinstall the application: If the error only occurs with a specific application or game, try reinstalling it. This can help fix any issues with corrupted files or other installation issues.

5. Run a virus scan: Malware or viruses can also cause the "D3DX9_39.dll missing" error. Run a full system scan with your antivirus software to check for any infections.

6. Manually download the DLL file: If all else fails, you can try downloading the missing DLL file and placing it in the appropriate directory. However, this should only be done as a last resort and is not recommended, as it may introduce security risks or cause further issues.

These are some basic steps you can take to fix the "D3DX9_39.dll missing" error on Windows. If the issue persists, you may need to seek additional technical assistance.