Hi!
Yes, you can actually remove it by either using this code in the functions.php file in the theme directory (copy from line 3):
..or if that does not work, then deactivating it manually by disabling line 225 in file wp-content\plugins\ajax-search-pro\includes\classes\core\class-asp-manager.php :
[php]//require_once(ASP_PATH . "/backend/metaboxes/default.php");[/php]
I recommend using the custom code, as it will work after updates as well.