I've noticed a lot of confusion about upgrades with Vista. It came to a head when we installed Vista Home Premium on an XP Pro system at work yesterday.
You can purchase (generally) 2 basic types of any Vista installation - either the "Full" or the "Upgrade" version.
The Full version doesn't require a previous OS to install - the Upgrade version does. That's the only practical difference - whether the installer checks for a previous version of Windows or not. After this point, it does not relate to the XP way of doing things (which is where the confusion comes in).
Once you're past the point of the installer determining Full or Upgrade - then the installation gives new meaning to the term Upgrade.
Vista will determine if you can "Upgrade" your previous OS to Vista - or if you'll have to do a clean install. In our case, we couldn't upgrade XP Pro to Vista Home Premium - it required a clean install.
Here's a link to a chart that will describe the requirements for this sort of "Upgrade" (MS calls it an "in-place" installation). Please note that the green dots are the only legitimate upgrade paths - the beige dots will require a clean install. http://www.microsoft.com/windowsvista/getr...pgradeinfo.mspx
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