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.
Download:
DirectX Redistributable for WinXP/XP x64/Vista/Vista x64