Vista: Installing DX9 game can kill your existing DX10 game

[looqas]

Here's the story in nutshell.

that the recent installation of some DirectX 9 games was the cause. Those games would install DirectX 9.0c as part of their installation process, just to ensure your PC would have the latest DirectX version installed.

By right, the reinstallation of DirectX 9.0c should not affect DirectX 10 at all. However, it appears that the reinstallation of DirectX 9.0c by those games have somehow corrupted DirectX 10 in Windows Vista. The solution was simple - reinstall DirectX 10, but this should not have been necessary. Microsoft should look into why installing DirectX 9.0c corrupts DirectX 10.

in this link there's the whole story and links to DX10 package.
http://www.techarp.com/showarticle.aspx?artno=515

[jake_]

that sucks

[Stormy{CAN}]

Which is why on a clean install of Windows (XP or Vista, doesn't matter) that you should download and install the latest DirectX update; which happens to be this one at the moment,

http://www.microsoft.com/downloads/details.aspx?FamilyID=1a2393c0-1b2f-428e-bd79-02df977d17b8&displaylang=en

then you won't have these kind of problems.