Changing TTS voices

Ok this might have been sed before, but i searched allot and wasent abole to find an answer. I have 2 pc's/ one 64 bit and one 32 , both windows 7. I want to install new voices at the computers to use with a programm (verbot 5). but no metter what, new installed languages wont be seen on the drop down menu. Only the god damn microsoft Anna. Any ideas on what i have to do??

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