This machine is "as new" Bought as a Refurbished unit and kept as a spare machine (never used) Operating system is XP Pro It has the original license key for Vista on the box so you could change it to that if you wish XP Pro was professionally loaded for me when I bought this Intel Core 2 E8400 Processor Small form factor (400x350x115) The Dell Optiplex is Dell's line of business desktops. Business grade desktops are typically built to a higher standard (build quality) than consumer models for the home market. This Small Form Desktop is well suited to either the Office Environment or for use as a Point of Sale Machine. Will post (tracked Parcel post) to South Island ask for quote if this applies