If an end user attempts to upgrade to an unsupported upgrade path, the end user may have to re-format the PC hard drive and/or may lose applications, files and settings available with the previous installed version of Windows. For example, the following upgrades are not allowed in the program : - Upgrades from Windows Vista Home Basic or Windows Vista Starter - Upgrades from Windows Vista Home Premium to Windows 7 Professional or Ultimate - Upgrades from Windows Vista Business to Windows 7 Ultimate