If you want to watch videos in your browser then you need to install a plug-in. On Macintosh computers the QuickTime plug-in is already installed. If you still use Windows XP with Internet Explorer 8 then you can install QuickTime. Otherwise, you can watch the MP4 videos. The QuickTime and the MP4 videos contain the same H263 stream. If you can’t watch the videos, then you can still download them to your harddisk.