Dell Inspiron 3000 Small Desktop  (Windows 7 Professional, 5th Generation Quad Core Intel Pentium J2900 Processor up to 2.66 GHz, 4GB DDR3, 500 GB HDD) Intel Pentium Processor J2900 (2M Cache, up to 2.67 GHz), Quad Core, 4 Threads, 4GB DDR3, 500GB 7200RPM HDD, Tray load DVD Drive (Reads and Writes to DVD/CD), Intel HD Graphics 4x USB 2.0, 1xUSB 3.0, HDMI, VGA, RJ-45 (10/100/1000 Ethernet), 3-stack audio jacks supporting 5.1 surround sound 802.11bgn + Bluetooth 4.0, 2.4 GHz, 1x1, Integrated 5.1 Audio, Inspiron 3646 Chassiss, MT, Black w/8:1 media card reader, Dell KB113 Wired Keyboard, Dell MS111 USB 3-Button Optical Mouse Windows 7 Professional English 64bit (Win 7 Pro pre-installed, Windows 8.1 Media included in package). Best Operation System for Business and Home Use.