Administration page doesn't appear! Help!

when i go to my website administration page..it says page not found.. but the administration folder on my server is there....but the site is telling me the page doesn't exist -.-...help me? whats going on?

Have you made any changes recently?  Check  inc/header.inc.php  and make sure administration is there;

$admin_dir                 = "administration";

What's your site url?

nah dude.. its not that... i already fixed it.... hmm it was wrong folder permissoin.....