Set in the steampunk Objectivist underwater dystopia of Rapture in the 1960's, Bioshock is a first-person shooter wherein the player arms and genetically modifies themselves in order to survive against the city's resident great minds-turned-maddened anomalies and aid a revolutionary leader named Atlas in overthrowing the city's ruling despot, Andrew Ryan.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.