Why does Windows XP Pro cost more than Windows 7 Pro? I am still running Windows 2000 on a desktop PC and thinking about upgrading the operating system. A Google search shows Windows XP Pro costing about $125. It shows Windows 7 Pro in the $80 range. Why on earth is an older system more expensive? Here are some of the Google Shopping search results. Windows XP Pro: LINK Windows 7 Pro: LINK Wanna kill these ads? We can help!