OS: XP SP2 / Vista SP1 / Windows 7 Processor: For XP 2.0 GHz P4 processor or equivalent; For Windows Vista and Windows 7 2.4 GHz P4 processor or equivalent Memory: For XP 1 GB RAM / Windows Vista and Windows 7 1.5 GB RAM* Graphics: 128 MB Video Card with Pixel Shader 2.0 support. Hard Drive: At least 500 MB** of free space with at least 1 GB of additional space for custom content and saved games.