I was troubleshooting an unattended installation of a particular application. The install seemed to hang right away so I figured it was presenting some kind of message (error?).

Using a Window Spy tool I made the setup process visible and saw the following message:


The unattended install was supplied by the vendor and apparently they use InstallAware.

The setup tries to create a Tray Icon, probably a setup progress indicator, but this fails because there is no shell running (the installation is pushed from a deployment server).