title: Remove existing version and install msi setup
body: <p>I am developing WPF application in C#. Currently my msi install the current application in machine.I need to check any existing version installed and remove the existing version installed in the machine and install the new one.</p>
  
  <p>Can any one help me how to check the installed application in the machine and uninstall that before installation of my new msi. </p>