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.

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2009-05-20

base

Region Free

Steam

Region free

Windows
Operating System: Microsoft® Windows® XP SP3, Vista SP1 *
Processor: Intel® Dual Core 2.0 GHz or AMD™ Athlon™ 4000+
Memory: XP – 1 GB RAM, Vista – 2 GB RAM
Hard Disk Space: 7.5 GB + 1 GB Swap File
Video Card: 3D Hardware Accelerator Card Required – 100% DirectX 9.0c compatible 256 MB Video Memory - ATI® Radeon X1600 or Nvidia® Geforce 6800 - NOTE: Nvidia 260 GTX & Nvidia 280 GTX are not supported.
Sound Card: DirectX 9.0c Compatible Sound Card
DirectX® Version: DirectX® 9.0c
* This product does not support Windows 95/98/ME/2000/NT or XP x64/Vista x64.