So I've had these copies of Vista Business and Ultimate sitting next to my desk ever since those free Microsoft deals started shipping. I'm looking to finally transition over to vista so I can put all of my memory into use. Currently I keep my windows on one partition and my data on another, which has allowed me to format my computer and keep my data without having to backup all my files (don't have an external to do that). My question is will I have to format the entire drive if I make the switch over to Vista? I don't want to lose my data and I don't want to back it up as its just too time consuming.