Free extensions for Joomla!

Hi,

I installed Xmap for Joomla 2.5. At first it seemed to work properly. Then one day it changed and I don't know why. Now I can no longer use the drop down menus in "Menus" section. I would like to change the frequency from "weekly" to "daily". I can't though. The menu does not work. How can I fix that? I have already re-installed it a couple of times. That did not fix it.