How to Remove DirectX 9
DirectX 9 is a version of the collection of programming application interfaces that are developed by Microsoft and used to manage multimedia tasks such as playing music and movies. Many versions of Microsoft Windows come equipped with DirectX already installed and ready for you to use. If you decide that you want to use a product other than DirectX 9 to manage your multimedia tasks, you will have to remove it from your computer first, which you can do as long as you are comfortable editing system keys within your registry.
Instructions
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Click "Start" and select the "Run" option. This will open a dialog box in which you will be able to type.
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Type in the word "regedit" into the dialog box to open the Registry Editor.
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Find the line that reads "HKEY_LOCAL_MACHINE" followed by the location "\Software\Microsoft\DirectX." This key is the folder containing the system for DirectX 9.
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Remove the entire DirectX 9 key by deleting the DirectX folder.
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Restart your computer to allow the changes to take effect.
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Tips & Warnings
Once you have deleted DirectX 9 from your computer you can launch older versions by typing "dxdiag" in the "Run" window.
Do not erase any other keys from the Registry Editor or you may create fatal errors in your computer's operating system.