Have you installed the voices on the Windows 7 system? TextAloud should recognize the voices once they're installed. If you've installed the voices and TextAloud is not seeing them, send me an email at firstname.lastname@example.org
and we'll take a look at it. It would help if you include TextAloud debug information with your email ... from the TextAloud main window, click Help -> Open Data Folder, locate the files TextAloudMP3.dbg, TextAloudMP31.dbg, TextAloudMP32.dbg and TextAloudMP33.dbg and attach them to your reply.