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Dodgy DirectX has always been a bit of a problem. Unlike VSTs, which are essentially DLLs that sit somewhere nice and sensible, and you can install and delete them easily, DirectX has to use an installer, and heaven only knows where it puts the appropriate files... although I understand that the real issue with removing them is that they end up as registry entries, and not necessarily straightforward ones either.
Probably the most useful thing I can suggest is that you look at this thread on the KVR forum, where there are a couple of suggestions.
Thanks Steve and ry. Using dxman I was able to remove the problem plugin and Audition was able to enable directx. Great!