All it installs is the optional side-by-side stuff that some DirectX applications need (D3DX, XAUDIO2, etc.). See 'Not So DirectSetup'. DirectX including DirectShow is built into Windows 7. The only way to install a 'newer' one is via a Service Pack, a Windows Update, or upgrade the OS. See KB 179113, 2454826, 2117917, and 2670838. Go to the Windows 7 Service Pack 1 download page on the Microsoft website. Select Install Instructions to see which packages are available for download, and make note of the one that you need. Select the appropriate language from the drop-down list, and then select Download. Select the packages you need to install, select Next, and then follow.
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