Without deeper knowign the issue: Are you trying to run an MSI from
another one ? If yes: Not recommended! The only workaround is to abuse
the InstallUI sequence for such an approach. This fails e.g. if user
runs installer without UI! A short fragment to illustrate such an
approach:

<CustomAction Id="Install_MSI" Impersonate="yes" Execute="immediate"
Directory="WindowsFolder" ExeCommand="msiexec.exe /i
&quot;c:\MyMSIpackage.msi&quot; /qb" Return="ignore" />
        <InstallUISequence>
                <Custom Action="Install_MSI" After="ProgressDlg">Not 
Installed</Custom>
        </InstallUISequence>

But to emphasis it again. Not recommended by MSDN but to be honest I
do a similat approach as well e.g. for deploying the VCRedists.


Regards
Tobias



2011/2/25 Samudra Vishvajith <vishv...@gmail.com>:
> Hi,
>
> In our WIX installer,
> a third party installer (postgresql server installer) is run as a custom
> action
>
> the third party installer starts and the following error message pops up.
>
> "Another program is being installed. Please wait until that installation is
> complete, and then try installing this software again"
>
> Any idea why this happens?
>
> --
> Vishva
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