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Minimum System Requirements:

CPU:Pentium 4 2.4 Ghz Single Core processor or equivalent (2.8 Ghz for Vista)
RAM:512 MB or more (1 GB for Vista)
VGA:DirectX 9.0c compatible* Video card with 128 MB or more memory and one of the following chipsets is required: ATI x1300 or greater; NVIDIA 6600 or greater; DirectX 9.0c compatible card with Shader Model 3.0 support.
HDD:10.5 GB or more free space