WordTalk

For people with reading and writing difficulties, having text reinforced by hearing it read aloud can be very useful. WordTalk is a free plug-in developed for use with all versions of Microsoft Word (from Word 97 upwards), which can help people with reading difficulties use Microsoft Word more effectively.

As well as speaking the text of the document it can be configured to work with keyboard shortcuts. It contains a talking dictionary to help decide which word spelling is most appropriate.
WordTalk discreetly integrates into Word’s toolbar and is highly configurable, allowing you to adjust the highlight colours, voice and the speed of the speech.

http://www.wordtalk.org.uk/index.html

Source: JISC RSC Scotland S&W