Drupal Theme Drop Down Menu Module

I have an existing drupal template that appears to not support drop down menus for the primary links at the top. I would like to have drop down menus. I have installed Nice Menus, but it will not work either, but appears that you can customize the code fairly simply to get them to work. I am open to other suggestions to get drop down menus as well. I will supply the template and nice menus module when I accept a bid. Thanks.