Activision and Infinity Ward have made available the game’s official PC specifications, so here we go. You can run it on either Windows 7 64-Bit or Windows 8 64-Bit, with at least an Intel Core 2 Duo E8200 2.66 GHZ / AMD Phenom X3 8750 2.4 GHZ or better processor, have a minimum of 6GB RAM, 40GB of hard drive space, NVIDIA GeForce GTS 450 / ATI Radeon HD 5870 or better, a DirectX compatible sound card, and DirectX 11 in tow. You will also need a broadband Internet connection for Steam and Online Multiplayer.
Bear in mind that these are just the minimum required to run the game, and from experience, you will certainly need a few steps higher than that to play Call of Duty: Ghosts, in all of its glory as Activision and Infinity Ward intended it to be.