How to Fix D3d9.dll

Install the Latest Version of DirectX Software
1. Navigate your Web browser to the Microsoft DirectX Downloads page (see Resources).
2. Click on the most recent version of the DirectX SDK. It is located under the 'Latest DirectX Release Notes' link.
3. Click 'Download' on the next page to download the installer. Save the file to an easily accessible place on your hard drive such as the desktop.
4. Double-click the installer file when it has finished downloading. Follow the on-screen instructions. You will be prompted to restart your computer after the download is complete.
Other Methods of Fixing D3d9.dll
5. Reinstall any game or application that was removed right before the DLL error started occurring.
6. Update a specific application or game if the DLL error only occurs within that application.
7. If D3d9.dll is missing, copy it from a computer with a similar configuration. Search for D3d9.dll by using the 'Search' feature in the 'Start' menu.