How to install provider during installation (custom action of MSI installer)

I need to installer parts of Microsoft Office to my Desktop application. I have created custom action for this purpose.

Installer started, but than ... ups, it said me that another installation is running. Of course another installation is running, because this is action only of main installation.

Hmmm, what I can doing to solve this issue?

Solution

Two msi can't run at the same time. Instead of custom action, try to install Office parts as prerequisites. Prerequisites can be used in bootstrapper.