Folks should have no trouble skating by on a dated rig as the game will supposedly run on an Intel Core 2 Duo or equivalent AMD processor, 2GB of RAM and a GeForce 8800 or Radeon HD 4200 graphics card.
Meanwhile, if you intend to experience the post-apocalyptic mayhem in all its glory, you'll need at least an Intel Core 2 Quad or AMD equivalent, 4GB of RAM and a GeForce 9800GTX or Radeon HD 5550. Regardless of your processor, memory and graphics configuration, Bethesda says the game requires Windows XP, Vista or 7 along with 25GB (yep, twenty-five gigabytes) of storage