The full version allows you to perform either a clean install or an upgrade.
However, i concur with John Barnes regarding the Backup of your data. Better
to be safe that sorry!
John Barnett MVP
Windows - Shell/User
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"Nigel Molesworth" <email@example.com> wrote in message
> Can you use a full version of Vista to perform an upgrade?
> What I mean is: will the Product Key work, and will installed programs
> remain intact?
> Why do I ask? Having to install XP to do a future install would be a
> PITA, so I'd rather buy the full version. However, ATM I'd prefer to
> do an upgrade to keep my existing installed programs.
> Nigel M