Just extract the contents of the tar.gz file to C:\wamp\www\drupal (to be able to extract files from tar.gz files you'll need install untar or winrar)
Next left click WAMPs tray icon and select phpMyAdmin. In the Create Database box type in drupal Click ok. Now go to [
localhost]
Follow the on screen instructions. When it asks for your database details enter root as the username (leave password blank) and type drupal as the database name.