Minimum Specs
2 GHz Intel Dual Core processor / 2.6 GHz Intel Single Core processor , or AMD equivalent (with SSE2)
1GB RAM (XP), 2GB RAM (Vista / Windows7)
256 MB DirectX 9.0c compatible graphics card (shader model 3)
1024×768 minimum screen resolution
20GB free hard disk space

Recommended Specs
2nd Generation Intel® Core™i5 processor (or greater), or AMD equivalent
2GB RAM (XP), 4GB RAM (Vista / Windows7)
AMD Radeon HD 5000 and 6000 series graphics cards or equivalent DirectX 11 compatible graphics card
1280×1024 minimum screen resolution
20GB free hard disk space