Dell OptiPlex Core 2 Duo E6550 @ 2.33 GHz/NEW 6GB DDR2/500GB HDD/DVD-RW/WINDOWS 7 PRO 64 BIT-(Certified Reconditioned) This certified reconditioned product is tested and certified by the manufacturer or by a third-party seller to look and work like new, with some signs of wear. The reconditioning process includes functionality testing, inspection and repackaging! Windows 7 Professional 64bit. PACKAGE DOES NOT include monitor or keyboard/mouse.