Alternative to Microsoft Anna

Has anyone had experience replacing the Microsoft Anna voice with one or more purchased voices? My sound application (meant for entertainment) using Access and Visual Basic for Applications that I began developing on a Windows XP PC worked satisfactorily with the three XP voices. Now under Windows 7, I am not pleased with 1-voice limitation and the way Anna frequently suffers from word run-on. I am just wondering if there have been any successes out there working with voices that have been purchased for a Windows 7 PC.

I'am personaly hate Microsoft Anna (She came with vista too!) I like Microsoft Sam better. I have the same problem

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