I am a photographer looking at using an ordering proofing system for prints but only works with windows machines. I have looked into using VMware Fusion along with vista. At any given time I have large amounts of photos on my drives and laptop. My question is how much space do you need to allow for the Fusion and Vista to run on New Mac Book 17 inch?? Basically only using the windows system to access their ordering system and then disconnecting when completed.