If your Drupal reports shows PHP register globals on it means your site might be unsecure. Tho fix this problem you might want to create a custom php.ini file in your root folde with the following code:
register_globals = off
Another method is to modify the .htaccess file. But you should be aware that register_globals has been removed since php 5.4, and in php 5.3 it is already deprecated, though can be used. You might want to go to your cpanel (or other configuration tool) and access Select PHP Version link. Swith to PHP version higher than 5.3.