You can get a 1-year licence from the CD of Personal Computer World April 2008 or download a trial from PC Tools. The trial won't expire but the differences are that you won't be to able to clean plugins, custom items or free space. It works on Windows Vista with Internet Explorer 7, Firefox 2.0, Mozilla, Netscape & Opera browsers.
You can schedule the Privacy Guardian to start when Windows starts but you still need to click Run Scan in Vista which is annoying since Vista is supported.
An improvement will be to run Privacy Guardian automatically when the browsers are closed.