The standard Windows Media Player plugin (version 6.4 or higher) is needed to play this presentation. As video on the Internet is still a rather messy business, there are some chances that this item will not work properly on your computer. Normally, with a recent version of Internet Explorer or Firefox there should be no problem, If you are running Netscape, or working on a Mac, there is a chance that you will have to download the plugin from a Microsoft server. Please, choose the plugin version that corresponds with your computer, browser and operating system.