Windows® XP SP 3 (32-64 bits) / Windows Vista® (32-64 bits) / Windows 7® (32-64 bits) CPU: (Minimum) 2.4 GHz dual core Intel or AMD processor (Recommended) 2.6 GHz quad core Intel or AMD processor, Core i5 or Phenom X2 Memory: (Minimum) 1 GB RAM (Windows XP) / 1 GB (Windows Vista and Windows 7) (Recommended) 2 GB for Windows ® XP, 2 GB for Vista / Windows ® 7 Video Memory: (Minimum) DirectX 10 compatible card with 512 MB RAM. Nvidia 8-series or AMD Radeon 3000 series graphics cards. (Recommended) DirectX 10 compatible card with 1GB of video memory, Nvidia 400-series or AMD 5000-series. HDD : 23 GB of free Hard Drive Space