If you have a graphics card made by NVidia then you can get 4 games for free including an 11 level demo of Portal: First Slice, Half-Life 2: Deathmatch, Half-Life 2: Loast Coast and Peggle Extreme. You need to create a free Steam account which will automatically detect your graphics card to get the games.
www.steampowered.com/nvidia/
HTH
Tom :D :D
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