OS: Windows Vista/XP Processor: AMD 64 3200+ or Intel Pentium 4 3.0Ghz or better Memory: 16 GB free hard drive space / 512 MB RAM (XP) / 1 GB RAM (Vista) Video Card: Shader 3.0 or better 256 MB nVidia Geforce 6600GT / ATI Radeon 1600XT or better