Internet Video

I've been trying to play a video clip on c-span .org. I've only been able to play it on XP with RealOne Player. I have RealPlayer as a plugin for netscape (I think, audio/x-pn-realaudio-plugin) but when I click on the video link I only get the message 'document done' but the video doesn't play. Anyone know how to watch video on c-span? Thanks, Jerome