Minimum System Requirements:

CPU:Intel Pentium IV 2.4GHz or equivalent processor
RAM:1GB RAM
VGA:DirectX 9.0c compatible video card. 128MB Pixel Shader 2.0 (NVIDIA GeForce FX or AMD/ATI Radeon 9700 video card)*
OS:Windows XP SP3, Vista SP1
HDD:8GB free hard disk space
 

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Minimum System Requirements:

CPU:Intel Pentium IV 2.4GHz or equivalent processor
RAM:1GB RAM
VGA:DirectX 9.0c compatible video card. 128MB Pixel Shader 2.0 (NVIDIA GeForce FX or AMD/ATI Radeon 9700 video card)*
OS:Windows XP SP3, Vista SP1
HDD:8GB free hard disk space

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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: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.
OS:Microsoft(R) Windows(R) 2000
Microsoft(R) Windows(R) XP (SP 2)
Microsoft Vista(TM)
HDD:10.5 GB or more free space

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Minimum System Requirements:

CPU:Intel Core 2 Duo 1.8 GHZ or AMD Athlon X2 64 2.4GHZ
RAM:1.5 GB Windows XP / 2 GB Windows Vista - Windows 7
VGA:256 MB DirectX 9.0 compliant card with Shader Model 3.0 or higher (ATI RADEON X1950, HD 2400/ NVIDIA GeForce 7)
HDD:6.5 GB
OS:Windows XP SP 3 (32-64 bits) / Windows Vista (32-64 bits) / Windows 7 (32-64 bits)

Download:

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

Minimum System Requirements:

RAM:1GB
VGA:256
HD:8 GB
Processor:2.8 GHZ