You will not be prompted for keys from a previous installation, instead you
will need either Windows 2000, Windows XP, or Windows Vista already
installed on the computer in order to install an upgrade version of Vista.
If you have a legit license of a previous qualifying OS, then you can just
install your Home Premium as long as one of the operating systems I mention
are already installed.
You will have to do a fresh install if you have Vista Enterprise, Business
or Ultimate already installed, or Windows 2000.
XP Home can be upgraded in place.
Note this applies to 32 bit versions only, 64bit is a different story.
"bearatone12" <bearatone12@xxxxxx> wrote in message
> Hi. I bought a computer in a silent auction at work. I thought the version
> Vista was legit but found out it has an enterprise license. I would like
> purchase and install Vista Home Premium but since I have a licensed copy
> XP Home, I am wondering if a) I'm entitled to use an upgrade license of
> Vista, and b) can I install Vista Home Premium over top of the existing
> enterprise edition and reference the XP license keys when prompted?