The Ultimate Guide to DirectX End-User Runtimes (June 2010): Why You Still Need It Today
The DirectX End-User Runtimes (June 2010) is a comprehensive redistributable package from Microsoft that provides legacy runtime libraries required by numerous older games and multimedia applications. Unlike the standard Windows DirectX installation, this package installs "side-by-side" technologies that are not included by default in modern Windows versions.
If you want to ensure your system is perfectly optimized, let me know: What is giving you an error?