The users registration solution pack is not configured for User level authentication, so it will take a little hands modification to get this working.
1) You will nee to add a user level column to the users table.
2) The User Level tutorial will help you get the user level information stored in a session variable.
the redirect will take a little coding.
on the profile page, you would add an if statement to redirect to the proper page based on the userLevel Session, for example:
<?php
if($_SEESSION['userLevel'] == 1) {
header("location: folder/page_1.php");
}
if($_SEESSION['userLevel'] == 2) {
header("location: folder/page_2.php");
}
?>
For the admin portion, you would need to use data assist to create the page where the administrator could edit the user lavel for the users.