Windows 7 Professional Installed by a Microsoft Authorized Refurbisher Dell 745 Optiplex SFF Computer,WIFI USB INCLUDED Featuring Intel’s Powerful & Efficient CORE 2 DUO E8400 3.0GHZ CPU Processor, Amazing 1333MHz Bus Speed & 6MB Cache 4GB DDR2 High Performance Memory, Large 750GB SATA Hard Drive, DVDRW/CDRW,