WordPress MU

I am trying to install WPMU on http://blogs.epsychology.us/ but I am getting that VHOST error. I also tried http://www.epsychology.us/blogs/ but I am getting the same error.
I have a brand new copy of the script, installed in an empty folder.
I had an older version of the script and it worked before. Today I wanted to install a new version so I removed everything and copied the files. To bad that it is not working and I cannot figure out why.

Any help would be appreciated.

I must say that I did search the forum but could not find any useful information.

I have find out what is the problem.

I have a blog at epsychology.us and for some reason it reads the config file from there.

What do I have to modify in order to help it get the right content?

[EDIT]
I have changed the wp-blog-header.php file to this:

<?php
include( "index-install.php" ); // install WPMU!
die();
$wp_did_header = true;
require_once( dirname(__FILE__) . '/wp-load.php' );
wp();
require_once( ABSPATH . WPINC . '/template-loader.php' );
?>

installed the script and put back the original file. It is working now.

This worked for me. Thanks.