OS: Windows Vista/7 Processor: 2 GHz Dual Core RAM: 2 GB Hard Drive: 20 GB available space Video Card: NVIDIA GeForce 8600 GT / ATI Radeon HD 2600 XT or greater DirectX: Version 9.0c XCOM Enemy Unknown PC Game Free Download Full Version - 28XCOM Enemy Unknown PC Game Free Download Full Version - 21XCOM Enemy Unknown PC Game Free Download Full Version - 20XCOM Enemy Unknown PC Game Free Download Full Version - 18