You can't upgrade away a per-machine install with a per-user install
and vice-versa. The best way to handle this is to set ALLUSERS
according to what was installed previously and not let them change it
during the upgrade. Another way of dealing with it is to cope with it
in a bootstrapper and force them to remove the old product before
installing the new one (which means its not an in-place upgrade at
that point).
--
"The Direct3D Graphics Pipeline" -- DirectX 9 draft available for download
<http://www.xmission.com/~legalize/book/download/index.html>
Legalize Adulthood! <http://blogs.xmission.com/legalize/>
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