BuddyPress.org

I am using Buddypress for a photography website.

I installed the plugin, and the pages created seems Not to work at all, It shows a Blank Page for Register, Activity, Group… etc. How can i fix this? The page seems to be in .html and Not ending a in Page_name/ is this causing the issue? I tried to uninstalled and install back, but not able to get it back to work….