404 Not Found Error
 

Good day* I just installed the vbulletin on my site* it shows the forumhome but when i click on a forum or thread it get the following errors. Any help would be much appreciated

The requested URL /display.php was not found on this server.
Additionally* a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.
Apache/2.2.13 (Unix) mod_ssl/2.2.13 OpenSSL/0.9.7a mod_auth_passthrough/2.1 mod_bwlimited/1.4 FrontPage/5.0.2.2635 Server at www.scavengercash.net Port 80