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When it comes to the Windows Vista, Microsoft is changing a long-standing tradition when it comes to upgrading from a previous version of Windows. No longer will popping in a disc of a previous version of Windows during setup satisfy the people in Redmond when using an upgrade CD.
For example, when performing a clean install of Windows XP Professional using an upgrade CD, users would run through the normal setup routine until prompted to insert a previous version of Windows. A user could pop in a Windows 98 or Windows 2000 CD for upgrade compliance and then the setup routine would move along as usual.
Source : *www.dailytech.com/No+More+Clean+Installs+Using+Upgrade+Discs+With+Windows+Vista/article5887.htm
For example, when performing a clean install of Windows XP Professional using an upgrade CD, users would run through the normal setup routine until prompted to insert a previous version of Windows. A user could pop in a Windows 98 or Windows 2000 CD for upgrade compliance and then the setup routine would move along as usual.
Source : *www.dailytech.com/No+More+Clean+Installs+Using+Upgrade+Discs+With+Windows+Vista/article5887.htm