I bought a windows home premium computer from Best Buy a few years ago along with a special purchase to upgrade to Windows 7 Professional. I did that but my upgrade key is not recognized when I try to download a windows 7 iso image file to use with
VirtualBox.
An order to use a Windows 7 Upgrade product key, there must be a previous qualifying version of Windows (i.e. Windows Vista) installed on the PC. Otherwise, you will need to purchase a
Windows 7 Full Version product key.