On the Microsoft Control Pannel, how can I change the voice from Microsoft Sam to something else?

My friend and I discovered the ';speach'; section on my computer's control pannel, and the only chose they gave us is Microsoft Sam. Is there a way I can change it? He gets boring after a while.On the Microsoft Control Pannel, how can I change the voice from Microsoft Sam to something else?
http://www.microsoft.com/msagent/downloa

http://www.microsoft.com/speech/evaluati

scroll down to ';Text-to-speech engines'; And download them, then the profile box will have more options. these are direct from microsoft, but there's more 3rd party free ones if you search around.On the Microsoft Control Pannel, how can I change the voice from Microsoft Sam to something else?
I prefer Kate16 from NeoSpeech.
You have to download another voice from microsoft.