CrazyTalk Animator doesn't come with any voices. The one voice you have found is part of your operating system. You can purchase additional voices from a variety of different companies as well as download some extra free voices.

Please take a look at the link below for more information. Also if you do a search of the forum for text to speech or TTS you will find a fair bit of discussion and advice on this subject. :)

http://www.reallusion.com/crazytalk/animator/animator_tts.aspx