OS: Windows 7 64-Bit / Windows 8 64-Bit / Windows 8.1 64-Bit
Processor: Intel Core i3-530 @ 2.93 GHz / AMD Phenom II X4 810 @ 2.60 GHz
Memory: 6 GB RAM
Graphics: NVIDIA GeForce GTS 450 @ 1GB / ATI Radeon HD 5870 @ 1GB
DirectX: Version 11
Network: Broadband Internet connection
Storage: 55 GB available space
Sound Card: DirectX Compatible
Additional Notes: Field of View ranges from 65°-90°.
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.