Ed Bott discusses the issue of using a Vista upgrade disk when doing a non-upgrade install.
Look, you can argue that Microsoft’s prices are inconsistent and illogical, but that has nothing to do with the issue at hand here. An upgrade license is intended to replace a previous license, period. Advising readers to violate the terms of a license agreement is pure sensationalism, and it’s wrong.
I know it isn’t a popular stance but I agree with him 100%. I pretty much said the same thing February of last year in my Installing Windows Vista guide.
3 – Do I need an Upgrade or Full version?
If you intend on installing Vista on a machine that already has a Windows operating system, and you intend to upgrade (install over it) then get an upgrade version. Otherwise the license requirement says you need a full version. Yes you can do a clean install using an upgrade disk (instructions below). Please note, the Vista license agreement states that if you use an upgrade version then the OS you installed Vista over is no longer valid. This may or may not be a technicality based on your own set of morals. Example, I recently got a new laptop from Dell which came with XP installed and a free upgrade to Vista when available. Since I wanted to dual-boot (run both OS’s) XP and Vista I could not legally use the upgrade disk so I had to buy the full version.
(please do not write to me and whine about how expensive Vista is to justify your using an upgrade disk. Vista is not a “must have”. Stick with XP or try Linux, it’s free.)