Windows
OS: Windows XP (Service Pack 2) or Windows Vista (Service Pack 1)
Processor: (XP) 2.0 GHz P4 processor or equivalent; (Vista) 2.4 GHz P4 processor or equivalent 
Memory: (XP) 1 GB; (Vista) 1.5 GB
Graphics: 128 MB Video Card with support for Pixel Shader 2.0
Hard Drive: At least 6.5 GB of hard drive space with at least 1 GB additional space for custom content
Built-in Graphics: Intel Integrated Chipset, GMA X3000 or above. 2.6 GHz Pentium D CPU, or 1.8 GHz Core 2 Duo, or equivalent, 0.5 GB additional RAM
Supported Video Cards: Nvidia GeForce series: FX5900 or greater, G100, GT 120, GT 130, GTS 150, GTS 250, GTX 260, GTX 275, GTX 280, GTX 285, GTX 295; ATI Radeon™ series: ATI Radeon 9500 series of greater, X300, X600, X700, X800, X850, X1300, X1600, X1800, X1900, X1950, 2400, 2600, 2900, 3450, 3650, 3850, 3870, 4850, 4870 series or greater; Intel® Graphics Media Accelerator (GMA): GMA 3-Series, GMA 4-Series *Please note that the GeForce 6100 and 7100 cards are not supported