What is the piece of code you are using to call the pages?
If it is using the wp_list_pages, use the following
wp_list_pages( exclude= THE PAGE ID );
I suggest, however, activating the new WordPress Menu system, which you can find information here: http://templatic.com/news/wordpress-3-0-menu-management
Ah stupid me I’m sorry, I didn’t read your question properly. You can remove it using the following steps here:
Hiding or Changing the List Heading
Hi
There is a Plugin called Pagemash that hids both Page and Post
tiles from appearing in the Nav Bar