REAL WORLD RACING is a top-down racing game using high-quality aerial imagery that lets you race through the world's greatest cities! Speed through London, Paris, Berlin, Rome and many other cities from a new and realistic perspective in a refreshing take on racing simulations.
Go to: http://store.steampowered.com/ and download STEAM client
Click "Install Steam" (from the upper right corner)
Install and start application, login with your Account name and Password (create one if you don't have).
Please follow these instructions to activate a new retail purchase on Steam:
Launch Steam and log into your Steam account.
Click the Games Menu.
Choose Activate a Product on Steam...
Follow the onscreen instructions to complete the process.
After successful code verification go to the "MY GAMES" tab and start downloading.