[support] Website migration / access denied error

Hello, I'm migrating a Drupal 5 website to a new web host. The new host has a newer version of Drupal 5. I am getting an access denied error: http://vulcan.unitedhosting.co.uk/~rosemarymusker.co.uk/ I ran update.php (I set $access_check to FALSE, ran it, and set it back to TRUE). The update ran successfully, but I still get the access denied error. The update script tells me to visit the administration pages, but that gives me access denied too. Help? I'm sure that there is a simple solution for all this, but I have not been able to find it. Thanks for the help. Daniel.