Speed Reader Enhanced is a lightweight speed reading software that will allow you to increase the speed at which you read.
The developer of Speed Reader Enhanced claims the application works by suppressing vocals - meaning, presumably, that it encourages you to read the words in your head, rather than sounding them out. You paste your text into the program window, choose the color and font of the text and background, and press Show Reader.
Speed Reader Enhanced then displays the text, word by word, in a fullscreen window. This fullscreen option allows you to concentrate on reading the text as fast as possible - you can modify the speed in the main window. You can pause the reader by pressing any key, but the application doesn't remember your text or position when you come out of the reader or close the application.
It's a bit light on options, but Speed Reader Enhanced is effective and free.