database won't give correct permissions
 

Hi, I'm attempting to set up dotnetnuke with Microsoft's SQL MSDE as my database. After getting SQL up and running, I created a database aptly named dotnetnuke, and a login called dnnuser. I set dnnuser's role on dotnetnuke to system administrator and it's role membership to db_owner. After altering the main Default.aspx file for dotnetnuke with the correct name for localhost, the login, and the password. It should allow me to connect, but it doesn't. I get an HTTP 401.3 error saying I'm not autorized to view that page.

What should I check out to fix this?