This tutorial will show you how to install a copy of Drupal on your computer. We'll be using the "Acquia Dev Desktop" from http://acquia.com. It is perhaps the quickest, easiest and most reliable way to run Drupal locally. (For P.C. version go here.)
Step 1: Download the Files
Start by visiting http://acquia.com and clicking on "Downloads" and then "Dev Desktop" from the top menu.
Step 2: Start the Installation
The full installation will now start and you'll see a progress bar. This might take several minutes.
You might get a firewall warning. If you do, click "Unblock" twice.
When the progress bar ends, you'll see a message saying "Congratuatlions, you're done!"
Step 3: Start the Site
You'll now see the main Acquia Dev Desktop control panel. Click "Go to my site" and you'll see your new Drupal site that you can start working on: