Hi Greg,
My problem is it that my user exists in admin group and I am able to install this msi in UI mode but it fails in silent mode. If it is privileges error then there are two point which are not clear to me -
1. My user is admin user and Plantronics experts say that admin can install Plantronics and I think they are right as I am able to install it on many machines though admin user. But on some machine installation fails in silent mode even if the user is admin. I am not sure if there could be a case where an admin user cannot have full privileges. As far as I know if user exists in admin group then it should have elevated privileges.
2. If I assume that user is non-admin on machine where my installation getting failed. But now question arises here that why am I able to install Plantronics in UI mode while it fails in silent mode. I have set the UAC level to minimum so that it does not raise any popup. In UI mode I do not get any password or permission dialog and installs Plantronics successfully but on the same machine it fails in silent mode.
Please suggest that what could be the cause of this inconsistency in UI and silent mode on some specific machines. Thanks