Found this info on a site and thought I'd pass it to you lot!
Quote:
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.
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.
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here to read the full article!
Yes - sorry - it does go to my site! (Plug plug!!)