OS: Windows XP SP2, Windows Vista SP1 or Windows 7 CPU: (XP) 2.0 GHz P4 processor or equivalent; (Vista and Windows 7) 2.4 GHz P4 processor or equivalent RAM: (XP) 1 GB RAM; (Vista and Windows 7) 1.5 GB RAM Hard Drive: At least 3.5 GB* of free space with at least 1 GB additional space for custom content and saved games Video: DirectX 9.0c compatible Video Card with 128 MB of Video RAM and support for Pixel Shader 2.0*9.6 GB if installing with The Sims 3