Alan would like to take the existing system he has and wipe it to get ready for the upgrade to Windows 10. He's wondering how Microsoft is planning to do the upgrade. Leo says that there will be a clean install upgrade available, but nobody really knows how it will work. Paul Thurrott has an article on it. He'll download an ISO disc image, put that on a bootable USB (great idea) or burn it to a DVD, save the key, and activate it. It'll be pretty straight forward.