Google is your friend."Text to speech" gave a couple of results. I assume it's english language version you're looking for?
http://www.naturalreaders.com/download.php BUT...recording the speech is another thing. You need a separate plugin for that, I think, if your soundcard does not have "What you hear"-setting. IIRC, there are several (free) recorder-plugins, but I've never needed one, so I can't recommend anything.
Then again, there are many free vocoders, as well.