To run QPR ProcessXpress installation silently, open the command prompt to the folder containing the QPRProcessXpress20121Setup.exe package and start the installation with the following command: QPRProcessXpress20121Setup.exe /s /v"/qn INSTALLDIR=\"<path where QPR ProcessXpress should be installed>\""

Once the QPR ProcessXpress icon has appeared on the desktop and the msiexec process is not running (see the Task Manager) anymore, you can start using the software. Note that the INSTALLDIR property needs to be defined and its value should be a path where QPR ProcessXpress gets installed, e.g. C:\Program Files\QPR ProcessXpress 2012.1.