Windows XP SP2 / Windows Vista / Windows 7 (32 or 64-bit)
Intel Core 2 Duo 1.8 Ghz or AMD Athlon X2 3800+
NVIDIA GeForce 7950 / ATI Radeon X1800 / Intel HD Graphics.
DirectX 9.0c Compatible Soundcard.
Version 9.0c or Higher.
8GB Free Disk Space.
1. Go to: http://store.steampowered.com/ and download STEAM client.
2. Click "Install Steam" (from the upper right corner)
3. Install and start application, login with your Account name and Password (create one if you don't have).
4. 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.