What you need to do is
download the French speech synthesiser first. This gives you the voice. That is
click on the 'telecharger' link on this page. It's
about 2.5 Mb. You also need to click here
to
download the software which actually reads the text. What will be read is the
text you input into the form box. There is a test sentence in there which you
can delete and paste in your own chosen bit of French.