This computer comes with a NEW, Original, Genuine, and Sealed Microsoft Windows XP Operating System CD and a NEW, Original, and Genuine Certificate of Authenticity from us. This UPGRADED DELL includes: A Huge 500Gb Sata Hard Drive, Fast DVD/CDRW (Records CD's and plays CD's and DVD's), 3 Gigabytes (3072MB) of DDR2 Ram Memory, and is loaded with great software (see below).