Opening Application Starts Windows Installer
You assign or publish a managed application with a Group Policy object, which a user installs. When the user opens the application, the Windows Installer starts.
Possible Causes:
The application is being repaired.
The application was assigned to the computer, and this user has not used the application, so there is user configuration that needs to complete.
A feature is being added to the installation.
The application is the base application of an upgrade relationship, so it is being upgraded.
Diagnostic Tests:
In all cases, allow Windows Installer to complete.
Check Event Viewer for the application log to see why Windows Installer starts.