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.
Download: DirectX Redist [March 2008] (Freeware, 69.5MB)
Download: DirectX End-User Runtime Web Installer [March 2008] (Freeware, 10 KB - 218.0 MB)
Download: DirectX SDK [March 2008] (Freeware, 442.1MB)
Link: Home Page