Download the "FREE" Acrobat Reader from the Adobe® Web Site.
Additionally, Adobe offers a plug-in for vision impaired users. The Access plug-in supplements the standard Acrobat and Reader display of PDF documents with an alternative view that supports screen-reading applications for Microsoft Win95, Win98, and WinNT. This view presents the textual content of a PDF file in a separate window. The window contains the text in an approximated reading order. Standard Acrobat features, such as hypertext links, notes, bookmarks, sounds, and movies, are available in the Access view.
You can download the Access plug-in download for Adobe Acrobat 5.x and Adobe Acrobat Reader 5.x at http://www.adobe.com/support/downloads/5efe.htm.
After downloading Acrobat Reader there are instructions on the Adobe® Web Site to configure your Web Browser to automatically load PDF formatted files.