Unable to initialize DirectSound 8 error.....

Running Vista, trying to use a program called Typing Instructor Deluxe, am getting fatal error message:
Unable to initialize DirectSound 8, please check drivers....

This happens on 3 different HP and Compaq Vista computers that are running the network version of this software.

I have tried running the program in XP SP2 compatibility mode, but that doesn't work.

And ideas?

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oh. ok you are running vista. Well heres what happened with Vista and why many games don't run. They jumped to Directx 10. But, they didn't include direct 9 (which is compatable all the way back to 8). So you need to download directx 9C. It should supplement the files need to run it.
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