This is a must if you are a gamer. The latest version of Microsoft DirectX is an essential if you are to gain the optimal performance in multimedia related tasks. Microsoft DirectX (Direct eXtension) is a collection of application programming interfaces for handling tasks related to multimedia, especially game programming and video, on Microsoft platforms.
This will update/install latest DirectX 9.0c runtime on your computer. The version featured in this post does not work with Windows Vista.
Get DirectX9 August 2007: Download Now! (Direct Download)