[xwiki-users] Unknown macro: html after fresh install

I'm afraid I've searched as much as I can, and cannot find an answer to this. I just did a fresh install of xwiki on Windows Server 2003, Apache/Tomcat(5.5.28), MySQL Server 5.1. I'm getting boxes with "! Unknown macro: html". I've also installed xwiki on my laptop running XP, Tomcat(6.0.26), MySQL Server 5.1, and had no problems. Can someone give me an idea of what might be causing this? I'm a java programmer, so I can get into nuts and bolts if necessary. Hopefully its not. If I have not provided enough information, please let me know and I'll be happy to expound. Thanks, Lenny