Hi,

The commonly used workaround is to install without using the Product key the
first time. This will allow you to do a clean install, make sure that you
choose the version you actually own a key for. Then run an upgrade from
within the freshly installed OS and use the Product key. Basically you
install twice.

--
Best of Luck,

Rick Rogers, aka "Nutcase" - Microsoft MVP
[url]http://mvp.support.microsoft.com/[/url]
Windows help - [url]www.rickrogers.org[/url]

"Eric" <spam@spam.no> wrote in message
news:Ojvwc9SYHHA.3268@TK2MSFTNGP04.phx.gbl...[color=blue]
> Can I install Vista Upgrade as a 'clean install' without previously
> installed
> XP on the HD or do I have to have XP already installed on the machine?
> Thanks
>
> Eric[/color]