I've tried searching online to see if and how this can be done. I have a new MacMini that I need to have Parallels 9 with Windows XP on. I would prefer to have those installed and run from a USB or Firewire external hard drive and keep my MacMini clean of all windows. I want to keep XP for now so I don't have to spend $$ upgrading my software that I am running on XP. I am sure there is a way that this can be done but I need some assistance in how to install and run it this way. Thanks.