Same problem here.
Clicking Submit in install.php leads to a blank page with Secretary header, attempt to login after that shouts "Sorry, that login information does not exist! Please try again."
Tested Chrome 49 and IE 11. Database (MySql 5.1.41) is filled with content (no user is created though), so connection to DB works. site.php is created too and config.inc.php is updated as well.
Noticed I was still running PHP 5.4, switched to 5.6 and problem still there.