You will need Windows XP and Word 2002 or 2003 for this to work.
1. In Windows, click on Start | Control Panel | Speech | Text to
Speech | <choose voice and volume settings> | OK. See
http://support.microsoft.com/?kbid=306902 "How To Configure and Use
Text-to-Speech in Windows XP" for more information.
2. Install all of the Alternative User Input features from the
Word/Office CD. These features are not automatically installed in a
typical installation.
3. In Word, click on Tools | Speech. It is not necessary to
completely configure Speech Recognition at this point, so you can click
on Cancel if you want to skip this part for now. The Language toolbar
should appear somewhere on the screen. Click on the little
downward-pointing triangle at the bottom right corner of the Language
toolbar, and make sure the "Speak Text" option is checked.
4. Open a Word document, click where you want Word to begin reading
aloud or select the text that you want Word to read aloud, and click on
the Speak button on the Language toolbar.