the loop – how to control whether wp or plug-in runs it

The problem was in my the loop.php file, i was executing a new loop using the wordpress parameters for the main loop, which caused a duplication with the plugin being used (thecartpress) which executes its own loop. I was using:

       global $post, $query_string, $discTheme;
       query_posts($query_string);

in a sense, with thecartpresses own loop, I was duplicating the loop for this page.

With the bright eyes of my friend the sensei, a simple removal of:

       query_posts($query_string);

fixed my duplication issue.

Hope this makes sense and helps anyone else out there.