DirectX (any version) cannot be uninstalled except with a few 3rd party DX uninstallers that have "mixed" reviews. M$ them selves say the only way to go back to an earlier DX is to format and reinstall, that being said, DX8a gave me an extra 150 in 3dmark2000 (5382) and I got 2873 in 3dmark2001.

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"....I didn't do it, I wasn't there, Nobody saw me do it, You can't prove anything...."
PCDB