[url]http://www.microsoft.com/windows/products/windowsvista/buyorupgrade/upgradepaths.mspx[/url]

You could try actually deleting the XP pro installation and files under
Documents and settings as well as all of the XP boot files
If there was almost nothing left of XP pro Vista just might install properly
into the "old" XP Pro
directory...............................................Seeing as Vista
needs to boot from the CD anyways.
peter
"Rod" <Rod@discussions.microsoft.com> wrote in message
news:B054F30A-A24C-46D7-8CB8-35E15CCC5EE7@microsoft.com...[color=blue]
>I have a PC that I have had for several years. It runs a copy of XP Pro SP2
> and is "Vista" ready in terms of HDD, RAM, Processor and Graphics card.
>
> I was ready to go out and get a copy of Home Premium Upgrade, as it has
> the
> features I want, and just read I would have to do a clean install. This
> is
> essentially a reformat of HDD and start from scratch, right? That's wacky.
> I
> want to UPGRADE.
>
> I don't want the extra expense of getting Vista Ultimate as it has bells
> and
> whistles I dont want, but that seems to be the only way I can UPGRADE and
> get
> Media Player/DVD Burning functionality built-in....
>
> ...AM I reading this right? An UPGRADE from XP Pro to Vista Home Premium
> is
> really a rebuid of my PC??????
>
> Rgds
>[/color]