title: How can I change the Java Runtime Version on Windows (7)?
body: <p>How can I change the Java Runtime Version on Windows.</p>
  
  <p>I installed Java&nbsp;7 for some tests, and now I need the old java6 as system default, but I don't want to uninstall the Java&nbsp;7 (I need it for later tests). Can I change the system-used <a href="https://en.wikipedia.org/wiki/Java_virtual_machine" rel="noreferrer">JRE</a> in the control panel/Java/JRE tab? I can change/edit/add/delete the user-used version, but not the system-used.</p>