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Have you checked your CHmods?
Your server probably refuses to use relative paths, so that php's require_once instructions can't find the files specified.
You can act the following way:
add the following string in inc/design.inc.php and admin/index.php
ini_set("include_path", "path_to_script");
you should replace "path_to_script" with the absolute path to your script's folder.
Regards
ArturA