Windows Installer (MSI) uses the following command line arguments to be silent:
Silent install or silent major upgrade:
msiexec.exe /i foo.msi /qn
Silent minor upgrade:
msiexec.exe /i foo.msi REINSTALL=ALL REINSTALLMODE=vomus /qn
Silent uninstall:
msiexec.exe /x foo.msi /qn
Executable path:
C:\Windows\system32\msiexec.exe