Get the October 2006 DirectX End-User Runtime

Microsoft DirectX is a group of technologies designed to make Windows-based computers an ideal platform for running and displaying applications rich in multimedia elements such as full-color graphics, video, 3D animation, and rich audio.

DirectX includes security and performance updates, along with many new features across all technologies, which can be accessed by applications using the DirectX APIs.

DirectX End-User Runtime Web Installer 

The Microsoft DirectX® End-User Runtime provides updates to 9.0c and previous versions of DirectX — the core Windows® technology that drives high-speed multimedia and games on the PC.

Get it here: DirectX End-User Runtime