This computer is ready to use right out of the box. A Warranty, Money Back Guarantee, and Free Tech Support is included. The unit has been through rigorous testing, has been fully cleaned, and cosmetically restored. It includes a fully licensed Microsoft Windows Operating System with the Certificate of Authenticity (COA) attached. This Seller, Blair Technology Group, is a Microsoft Authorized Refurbisher (MAR) and is held by Microsoft to very strict product & licensing standards. Blair Technology Group fully certifies that this computer is in excellent working condition.