What you'll need:
1. Drupal latest version http://drupal.org/download
2. Wamp5 grab it from http://www.wampserver.com/en/index.php
1. Install Wamp
2. unzip Drupal into your wamp's www folder. Rename drupal-5.1 directory to drupal (eg C:\wamp\www\drupal)
3. Run WAMP, you should get a wamp icon in your system tray. You need the dial to be white to continue. Note if you run Skype, it interferes with WAMP ...