Do not install drupal. Create the database and put the 5x files in the root folder. Put the COD module into the profile folder. Create a modules folder in the COD folder. There is a list of modules in the COD readme. Put all of them in profile/COD/modules. Now when you go to install.php, you can choose the COD install instead of the default. Create a themes folder in profile/COD and put the conference theme in it. There are more specific instructions. Follow all of them in the readme.