I can’t recall ever seeing a disc with an upgrade designed for a specific operating system. That doesn’t mean there isn’t one; it’s just the first time I’ve heard it put that specifically. So, I can’t say exactly what’s required here, but I can absolutely run down the likely and not-so-likely scenarios.
Leo, I’ve been thinking about reinstalling my operating system but I’m not sure I can with the installation disc that I have. I had Windows Vista and I then upgraded to Windows 7 Home Premium with a disk that states in the upper left corner of the package, “Upgrade designed for Windows Vista”. Does this mean that it will only install if Windows Vista is present? Or will it install Windows 7 Home Premium on a clean hard disk?