Garyh,
Since you are running it with no switches it is likely popping up to ask for the user to accept the EULA, but the Delivery Method is supressing the UI. While you are setting the package up, try using a delivery method that is set to Show Feedback. As far as the install switches go, Microsoft would have the info on which switches need to be in there for it to install. That being said here is the command line we use for silent install in our Patch install.
"ie11-windows6.1-x64-en-us.exe /quiet /passive /norestart /update-no"
Bryce.