If you already have Microsoft Reader installed, it is recommended that you choose the Microsoft Reader Update installation option. If you choose to download the full installation, uninstall Microsoft Reader through the Add/Remove Programs control panel before you run the installation utility.
Microsoft Reader is designed to make your onscreen reading experience as close as possible to reading a printed book. In addition, it adds active reading capabilities, instant access to content, and a personal library. Features include high-resolution ClearType and an add-on dictionary, as well as the ability to bookmark, highlight, annotate, make notes and drawings, and much more. Version 2.1.1 includes a security update that closes known gaps in the Microsoft Reader security architecture.