Quiet Install of an MSI

My project has AJAX Extensions as a prerequisite. So, it needs to run the APSAJAXExtSetup.msi. It needs to run it as a prereq for my install. Also, I don't want my users to see, I want it installed for all users and I don't want it to run if it exists.

First, I found this link which was helpful. That and running the MSI with /? to get the help list got me the following command line.

APSAJAXExtSetup.msi /quiet ALLUSERS=2

I guess I need to back up a moment. I had to create a prerequisite in IS before all this. There didn't seem to be a standard one for AJAX extensions. In the Redistributable view, I added one. I then added the MSI on the File To Include tab. Then on the Application to Run tab I selected the MSI. The parameters can then be put into command line box on the Application to Run tab.

In order to conditionally run the MSI, you need to set a condition on the conditions tab. You need to specifiy a registry key or a file to check for that shows the package exists. To find a something, I opened the AJAX MSI in InstallShield and started poking around. I looked at the Registry view and settled on the key

HKEY_CURRENT_USER\Software\Microsoft\ASP.NET\ASP.NET 2.0 AJAX Extensions

I set the condition that if the key does not exist, run the prerequisite.

*EDIT* I guess the install is not completely silent. InstallShield has a dialog with a status bar showing that a prerequisite is being installed and what the prereq is. But the actual dialogs from the MSI package don't show.