I am looking at purchasing an EfiLive AUTOCAL http://www.efilive.com/index.php?op...rticle&id=53:autocal&catid=33:general-contect I have a new MacBook Pro 17" (i7). All I have ever used is Mac Apps for over 20 years (never even looked at a PC). I am planning to use Boot Camp to install some version of Windows that will allow me to run this single app to tune my car. I cannot tell what Windows version is required and I am looking for the cheapest thing that will work to install this one application. I seriously doubt that I will even need to use Windows for anything else, but I am totally confused by all the many versions of Windows OS installations for sale. Any ideas?