Then create a response file with parameter /r:

"/r : Record mode (Standard projects only)
In order to run a Standard-project installation program in silent mode, one must first run Setup.exe with the /r switch to generate a response file, which stores information about the data entered and options selected by the user at run time.
Running a Standard installation program with the command Setup.exe /r displays all the run-time dialog boxes, and stores the data in a file called Setup.iss, created inside the system's Windows folder. To specify an alternative response file name and location, use the /f1 argument, described below.
Basic MSI projects do not create or use a response file for silent installations." ( Q105473 - Installshield)

Otherwise use Wise/Installshield or Wininstall to create a MSI or MST file.... and start it from the script.. [Big Grin]
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Co