php nuke problem

Hey guys, I just setup php nuke (damn,thats a big package) but the problem is that i cannot create a super user ,go the admin, or do anything when i go to index.php it tells me to create a super user by clicking the link,after i click that link i go to admin.php and when i fill that form,it just displays the same form over and over again...the super user/ admin user does not get created... on the left of the page i have a list of "modules" when i click on any of the modules i get this... "Sorry, you can't access this file directly..." Whats the problem? Please help, Cheers, -Ryan.