Hi,
No, you can't install Basic over the Premium. Instead, start the Basic
upgrade without inserting the product key by booting from the disk. Choose
Basic from the picklist after bypassing the product key prompt and complete
setup. Once finished, start the system and reinsert the Basic disk and
restart setup, this time entering the product key.
--
Best of Luck,
Rick Rogers, aka "Nutcase" - Microsoft MVP
http://mvp.support.microsoft.com/
Windows help -
www.rickrogers.org
"NSA" <> wrote in message
news:O8YI$...
>I have two computers both with WIN XP. I purcahsed two Vista's OS. The
>Vista
> Home Premium was for a clean install on one computer (desktop); the other
> Vista is a Home Basic upgrade intended for the laptop. I now prefer to do
> a
> clean install on both computers. Can I clean install the Premium on the
> laptop as a trial; then install the upgrade Basic on the laptop as a
> registered; and then clean install the Premium on the desktop as a
> registered version?
>
> NSA