Scripting

Hi

I am working on an application. It requires SQL server 2008 R2 as a pre-requisite. Provided source is installshield.exe and when i install application it installs pre-requisite and all. problem is i cant create setup.iss or exe has any silent switches. it exctras msis for main application and pre-requisite which is sql server 2008 and i am able to find exe for sql server also. so in total i have exe and msi for sql server. but niether exe works for any silent switches or msis install. i have tried everything mentioned here. but cant figure out silent installation for sql server.attached sreen shot for reference