Iuvenalis said:
Are you absolutely sure about this?
I've never used Vista upgrade but no other upgrade version of windows
has worked this way.
In the past, the upgrade verion is exactly the same as a full version,
the only difference being that the upgrade looks for a qualifying
product before it will let you install it. That qualifying product
doesn't need to be installed either, you could run the upgrade disk on a
system with either a clean formatted disk. or a partitionless disk &
when prompted insert the installation CD for a qualifying product for
setup to check.
There was no need to have it installed.
I'm afraid that's changed with Vista's Upgrade process. Vista's
Upgrade process been intentionally redesigned to upgrade over only an
installed, activated, and validated earlier OS; simply inserting the
older OS' CD during the upgrade no longer works. Apparently Microsoft
felt too many people were (or potentially could) using "borrowed" CDs to
fraudulently qualify for Upgrades to which they weren't legitimately
entitled.
What "Brink" described is a convoluted workaround to use an Upgrade CD
to perform a clean installation. Personally, I think it's a great waste
of time, as upgrades have come a long ways since the days of Win9x.
Some people will blindly recommend that one always perform a clean
installation, rather than upgrade over an earlier OS. For the most
part, I feel that these people, while usually well-intended, are living
in the past, and are either basing their recommendation on their
experiences with older operating systems, or are simply inexperienced
and uninformed.
Certainly, there are times when an in-place upgrade is
contra-indicated:
1) When the underlying hardware isn't certified as being fully
compatible with the newer OS, and/or updated device drivers are not
available from the device's manufacturer. Of course, this condition also
causes problems with clean installations.
2) When the original OS is corrupt, damaged, and/or virus/malware
infested. I've also seen simple, straight-forward upgrades from WinXP
Home to WinXP Pro fail because the computer owner had let the system
become malware-infested. Upgrading over a problematic OS isn't normally
a wise course to establishing a stable installation.
3) When the new OS isn't designed to properly, correctly, and safely
perform an upgrade.
A properly prepared and maintained PC can almost always be
successfully upgraded by a knowledgeable and competent individual. I've
lost count of the systems I've seen that have been upgraded from Win95
to Win98 to Win2K to WinXP and some of them now to Vista (usually with
incremental hardware upgrades over the same time period), without the
need for a clean installation, and that are still operating without any
problems attributable to upgrades.
--
Bruce Chambers
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They that can give up essential liberty to obtain a little temporary
safety deserve neither liberty nor safety. -Benjamin Franklin
Many people would rather die than think; in fact, most do. -Bertrand Russell