It includes an Original Genuine Licensed Windows XP Operating System with a new sealed Official Microsoft CD from a Microsoft Authorized Refurbisher. Beware of Software Piracy. Many other sellers offer a non-original copy of Windows XP. A non-original or counterfeit copy may leave your computer at risk and inhibit your right to critical security updates and is also illegal. SUPER FAST DELL Optiplex Pentium 4 2.8 GHz computer system ready to use. This UPGRADED DELL includes: A big 19 Inch LCD Flat Monitor, 2 Gigabytes of DDR2 Ram Memory, a Giant 250GB Hard Drive, Fast DVD Burner (Plays/Records DVDs and CDs), loaded with great software. It is ready for any Cable/DSL internet connection. Also included : Scrolling Mouse, Keyboard. The Dell Optiplex was designed for heavy professional use at large fortune 500 companies. They differ greatly from the Dell consumer line of computers sold in stores, which are usually not as high quality. The Dell Optiplex cases and interiors are more durable and very well designed for the demanding corporate customer. This Dell Optiplex is an excellent choice for Office, Home, or School. Students, Professionals, Educators, and Parents can all benefit from this computer. Even in demanding network environments where multiple computers are inter connected, and consistent operation is a must, the Dell Optiplex is a proven performer.