Problem to install IspCP ubuntu 8.04 LTS

[deepy]

mhh installation works successfully i think i get this messages:

Module php4 does not exist!
Module php5 already disabled
This module is already enabled!
Module ispcp_fastcgi does not exist!
This module is already enabled!
Module fcgid already disabled
This module is already enabled!
Module fastcgi disabled; run /etc/init.d/apache2 force-reload to fully disable.
This module is already enabled!
This module is already enabled!
This site is already enabled!
System startup links for /etc/init.d/ispcp_daemon already exist.
System startup links for /etc/init.d/ispcp_network already exist.
Site 000-default does not exist!
This site is already enabled!
-en Setting GUI Permissions:
.... done
Setting Engine Permissions: .. done

Starting services: ...........

Congratulations you installed ispCP '1.0.6 OMEGA' successfully!

Please type http://h1787635.stratoserver.net in your browser and
log in with your Administrator Account to use ispCP.

if i try to open http://h1787635.stratoserver.ne i get a download which the following php content:

<?php
/**
* ispCP ω (OMEGA) a Virtual Hosting Control System
*
* @copyright 2001-2006 by moleSoftware GmbH
* @copyright 2006-2010 by ispCP | http://isp-control.net
* @version SVN: $Id: index.php 2599 2010-02-11 15:08:57Z benedikt $
* @link http://isp-control.net
* @author ispCP Team
*
* @license
* The contents of this file are subject to the Mozilla Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
* License for the specific language governing rights and limitations
* under the License.
*
* The Original Code is "VHCS - Virtual Hosting Control System".
*
* The Initial Developer of the Original Code is moleSoftware GmbH.
* Portions created by Initial Developer are Copyright © 2001-2006
* by moleSoftware GmbH. All Rights Reserved.
* Portions created by the ispCP Team are Copyright © 2006-2010 by
* isp Control Panel. All Rights Reserved.
*/

require 'include/ispcp-lib.php';

if (isset($_GET['logout'])) {
unset_user_login_data();
}

do_session_timeout();

init_login();

if (isset($_POST['uname'])
&& isset($_POST['upass'])
&& !empty($_POST['uname'])
&& !empty($_POST['upass'])) {

$uname = encode_idna($_POST['uname']);

check_input(trim($_POST['uname']));
check_input(trim($_POST['upass']));

if (register_user($uname, $_POST['upass'])) {
redirect_to_level_page();
}

user_goto('index.php');
}

if (check_user_login() && !redirect_to_level_page()) {
unset_user_login_data();
}

shall_user_wait();

$theme_color = isset($_SESSION['user_theme'])
? $_SESSION['user_theme']
: Config::get('USER_INITIAL_THEME');

$tpl = new pTemplate();

if ((Config::get('MAINTENANCEMODE')
|| databaseUpdate::getInstance()->checkUpdateExists()
|| criticalUpdate::getInstance()->checkUpdateExists())
&& !isset($_GET['admin'])) {

$tpl->define_dynamic('page', Config::get('LOGIN_TEMPLATE_PATH') . '/maintenancemode.tpl');
$tpl->assign(
array(
'TR_PAGE_TITLE' => tr('ispCP Omega a Virtual Hosting Control System'),
'THEME_COLOR_PATH' => Config::get('LOGIN_TEMPLATE_PATH'),
'THEME_CHARSET' => tr('encoding'),
'TR_MESSAGE' => nl2br(Config::get('MAINTENANCEMODE_MESSAGE')),
'TR_ADMINLOGIN' => tr('Administrator login')
)
);

} else {

$tpl->define_dynamic('page', Config::get('LOGIN_TEMPLATE_PATH') . '/index.tpl');

$tpl->assign(
array(
'TR_MAIN_INDEX_PAGE_TITLE' => tr('ispCP Omega a Virtual Hosting Control System'),
'THEME_COLOR_PATH' => Config::get('LOGIN_TEMPLATE_PATH'),
'THEME_CHARSET' => tr('encoding'),
'TR_LOGIN' => tr('Login'),
'TR_USERNAME' => tr('Username'),
'TR_PASSWORD' => tr('Password'),
'TR_LOGIN_INFO' => tr('Please enter your login information'),
// @todo: make this configurable by ispcp-lib
'TR_SSL_LINK' => isset($_SERVER['HTTPS']) ? $_SERVER['HTTPS'] . 'http://' . htmlentities($_SERVER['HTTP_HOST']) : 'https://' . htmlentities($_SERVER['HTTP_HOST']),
'TR_WEBMAIL_SSL_LINK' => "webmail",
'TR_FTP_SSL_LINK' => "ftp",
'TR_PMA_SSL_LINK' => "pma",
'TR_SSL_IMAGE' => isset($_SERVER['HTTPS']) ? 'lock.png' : 'unlock.png',
'TR_SSL_DESCRIPTION' => !isset($_SERVER['HTTPS']) ? tr('Secure Connection') : tr('Normal Connection')
)
);

}

if (Config::get('LOSTPASSWORD')) {
$tpl->assign('TR_LOSTPW', tr('Lost password'));
} else {
$tpl->assign('TR_LOSTPW', '');
}

$tpl->define_dynamic('page_message', 'page');
gen_page_message($tpl);

$tpl->parse('PAGE', 'page');
$tpl->prnt();

if (Config::get('DUMP_GUI_DEBUG')) {
dump_gui_debug();
}

and if i try to open server /iscp/gui/index.php i get error 404 with the iscp error site
With IE 8 i get Internal Server error 500
what can i do then?