If I install a retail version of Vista Ultimate on a home built computer can I make unlimited image copies and use them in the same computer? Specifically, I want to install all of my software and data on a “primary” drive and use Ghost or Acronis to create two or three copies. One would be a backup that I would update regularly and another would be a “play” or “test” drive. Will Microsoft allow me to do this with one install key? Will I need to call them? Thanks!