STUCK AND GOING CRAZY! Cannot configure Website - ACCESS DENIED. Hellllp!

Thanks Johnnywoo. Please bear with me here - I don't understand the technical bits here at all (eg. I havent got a clue what an echo is)

Here are two sets of code from Menu.inc:

define('MENU_FOUND', 1);
define('MENU_NOT_FOUND', 2);
define('MENU_ACCESS_DENIED', 3);
define('MENU_SITE_OFFLINE', 4);

and...

function menu_execute_active_handler($path = NULL) {
if (_menu_site_is_offline()) {
return MENU_SITE_OFFLINE;
}
// Rebuild if we know it's needed, or if the menu masks are missing which
// occurs rarely, likely due to a race condition of multiple rebuilds.
if (variable_get('menu_rebuild_needed', FALSE) || !variable_get('menu_masks', array())) {
menu_rebuild();
}
if ($router_item = menu_get_item($path)) {
if ($router_item['access']) {
if ($router_item['file']) {
require_once($router_item['file']);
}
return call_user_func_array($router_item['page_callback'], $router_item['page_arguments']);
}
else {
return MENU_ACCESS_DENIED;
}
}
return MENU_NOT_FOUND;
}

Here is the code from profile.pages.inc:

// Do not allow browsing of private and hidden fields by non-admins.
if (!user_access('administer users') && ($field->visibility == PROFILE_PRIVATE || $field->visibility == PROFILE_HIDDEN)) {
drupal_access_denied();
return;
}

here is a big one from user.pages.inc, it's at the end:

function user_pass_submit($form, &$form_state) {
global $language;

$account = $form_state['values']['account'];
// Mail one time login URL and instructions using current language.
_user_mail_notify('password_reset', $account, $language);
watchdog('user', 'Password reset instructions mailed to %name at %email.', array('%name' => $account->name, '%email' => $account->mail));
drupal_set_message(t('Further instructions have been sent to your e-mail address.'));

$form_state['redirect'] = 'user';
return;
}

/**
* Menu callback; process one time login link and redirects to the user page on success.
*/
function user_pass_reset(&$form_state, $uid, $timestamp, $hashed_pass, $action = NULL) {
global $user;

// Check if the user is already logged in. The back button is often the culprit here.
if ($user->uid) {
drupal_set_message(t('You have already used this one-time login link. It is not necessary to use this link to login anymore. You are already logged in.'));
drupal_goto();
}
else {
// Time out, in seconds, until login URL expires. 24 hours = 86400 seconds.
$timeout = 86400;
$current = time();
// Some redundant checks for extra security ?
if ($timestamp < $current && $account = user_load(array('uid' => $uid, 'status' => 1)) ) {
// Deny one-time login to blocked accounts.
if (drupal_is_denied('user', $account->name) || drupal_is_denied('mail', $account->mail)) {
drupal_set_message(t('You have tried to use a one-time login for an account which has been blocked.'), 'error');
drupal_goto();
}

// No time out for first time login.
if ($account->login && $current - $timestamp > $timeout) {
drupal_set_message(t('You have tried to use a one-time login link that has expired. Please request a new one using the form below.'));
drupal_goto('user/password');
}
else if ($account->uid && $timestamp > $account->login && $timestamp < $current && $hashed_pass == user_pass_rehash($account->pass, $timestamp, $account->login)) {
// First stage is a confirmation form, then login
if ($action == 'login') {
watchdog('user', 'User %name used one-time login link at time %timestamp.', array('%name' => $account->name, '%timestamp' => $timestamp));
// Set the new user.
$user = $account;
// user_authenticate_finalize() also updates the login timestamp of the
// user, which invalidates further use of the one-time login link.
user_authenticate_finalize($form_state['values']);
drupal_set_message(t('You have just used your one-time login link. It is no longer necessary to use this link to login. Please change your password.'));
drupal_goto('user/'. $user->uid .'/edit');
}
else {
$form['message'] = array('#value' => t('

This is a one-time login for %user_name and will expire on %expiration_date.

Click on this button to login to the site and change your password.

', array('%user_name' => $account->name, '%expiration_date' => format_date($timestamp + $timeout))));
$form['help'] = array('#value' => '

'. t('This login can be used only once.') .'

');
$form['submit'] = array('#type' => 'submit', '#value' => t('Log in'));
$form['#action'] = url("user/reset/$uid/$timestamp/$hashed_pass/login");
return $form;
}
}
else {
drupal_set_message(t('You have tried to use a one-time login link which has either been used or is no longer valid. Please request a new one using the form below.'));
drupal_goto('user/password');
}
}
else {
// Deny access, no more clues.
// Everything will be in the watchdog's URL for the administrator to check.
drupal_access_denied();
}
}
}

I hope all this makes sense - it doesn't to me! Thanks again.