Updated to 2.5 then 404’d on main page.

I recently upgraded from 2.1 up to 2.5.

I did all the simple stuff, delete wp-admin/include and backed up my old database blah blah.

I did upgrade.php just fine, it told me my database was up to date. Then now I try to access my main index page, I get a 404 error every single time. I can still use the admin panel perfectly and all my links look fine, but I can’t understand why my site still isn’t viewable. Problems?