[support] I can't access my site!

Hello, I have moved a Drupal site to a new host and I can't access it! It gives me an access denied error and I believe that it is something with Drupal. Here is the site: http://rosemarymusker.co.uk/index.php I'm sure that it is a Drupal error because if you go to the update page you see this: http://rosemarymusker.co.uk/update.php You can see that this is a Drupal page, that Drupal itself is accessible and working but Drupal refuses to allow access. So the access denied error must be a problem with Drupal. Does anyone have any suggestions? Daniel.