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.PC enthusiasts who want to start with a clean HDD will need to:
Microsoft has cut out this process for Windows Vista and forces users who buy an upgrade CD to actually have a valid install of Windows XP Home or Professional on their machines before upgrading.
For most users, this wouldn't be a problem. They more than likely have an existing copy of Windows XP installed and would have no problems upgrading to Windows Vista with an upgrade CD.
But for do-it-yourselfers who buy a Vista upgrade CD and think that they can easily perform a clean install whenever they feel free are going to run into the road block.
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1. Install Windows XP
2. Activate Windows XP through Microsoft
3. Upgrade to Windows Vista from within Windows XP