If you bought the upgrade online via Windowsmarketplace, then no, it has to
be an inplace upgrade. The 3 files that you download do not give you a
working bootable DVD that would be required for a clean install. I believe
there was an option during purchase to have physical media sent out.
--
Jane, not plain

64 bit enabled :-)
Batteries not included. Braincell on vacation ;-)
"Peter" <Peter@discussions.microsoft.com> wrote in message
news:E14E16A0-4E53-474B-919C-6B91C8F7C71D@microsoft.com...
>I want to clean install windows vista from a downloaded upgrade version
> because I read that the performance of the computer will improve. How can
> this be done?