We are creating an MSI package using the InstallSheild 2012 Spring Express edition. We are installing a MSI silently through a batch file. Our MSI consist of a Custom Action that launches a .NET application. If for some reason this .NET exe fails, InstallShield displays error messagebox even during the silent installation. Can you please let us know is there any way to suppress this error message. Also we found that during successful silent installation an window installer dialog box is always displayed on the screen. Is there any way to hide this dialog box too.