On UAC systems a check like the one you have will not always work properly
because Privileged doesn't get set until an MSI elevation prompt which is
after the launch conditions.
That check works when you run from an elevated prompt because that forces
elevation of the entire MSI including the launch condition, but it won't
work from an uninstall unless the uninstall is also elevated. To guarantee
that you are actually elevated you need a check for Privileged early in the
Execute sequence, with a type 19 custom action to stop the install
operation. I've forgotten what that type 19 is in WiX.
That seems to be the issue as far as I can tell. This may help:
http://blogs.msdn.com/b/rflaming/archive/2006/09/21/765665.aspx
together with the MSIUSEREALADMINDETECTION property.

Phil Wilson


On Mon, Nov 18, 2013 at 6:06 AM, Смагин Александр Михайлович <kf-...@list.ru
> wrote:

>  Hi,
> I create msi to install our company software. During installation it's
> required to register COM object. it requires admin privileges.
> I use the following condition to detect admin privileges
>
> <Condition Message="Only administrator is allowed to install the
> application.">
> (Privileged and (VersionNT = 601 Or VersionNT = 602 or VersionNT = 603))
> or VersionNT = 501
> </Condition>
>
> There is no problem when I install it on win 8.1, I execute it as
> administrator from popup menu.
> Diring uninstalling I should unregister COM object and remove folder from
> ProgramFiles. When I try to unuinstall it during add/remove programs, It
> says that I'm not admin and does not allow to remove it. If I ommit this
> condition, then installer doesn't remove files from ProgramFiles and
> doesn't unregister COM object. Please help me to avoid it?
>
> Thanks,
> Alex
>
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