Dell XPS Tower (410) in Brooklyn, New York

Hello for sale is a Dell XPS 410 Tower that needs to be re-formatted but has 1 terabyte hard drive. I think the tower had windows 7.. If you choose to reformat its soley up to you. I dont have the service tag # but do you have the product key # which # BD8QT-GQ6TR-44HQR-33Q7J-QYYCW