Is it possible to download more voices for Windows Narrator?
go to this page:
Download the file called: SpeechSDK51.exe. Extract it then install it.
Now, go to the registry (Start Menu > Run > regedt32) and navigate
through the folders (keys) like you would windows explorer. Go to the
Over in the right pane where it has the folder contents, double-click
"VoiceData" to open it. Go to the value data bar, find where it says
"sam.spd" and change it to
"mary.spd" (or mike.spd). Go to the
"VoiceDef" item right under it and change "sam.sdf" to "mary.sdf". And
you're done. If you want to change it back, just go back in the registry
and change it back to sam.spd & sam.sdf.Read more: http://wiki.answers.com/Q/Get_new_Microsoft_narrator_voices#ixzz1nUlKxoGF
To download voices check these site for a big list
check out these sites for more info
I hope it helped