I am going to buy a Macbook Pro (with 4Gb RAM), and I have heard that while running windows via bootcamp, Windows is unable to use 4 Gb of RAM. I have heard that it just can use up to 3 Gb maximum. Is this true? Also, I am wondering whether or not to install Vista or XP. I am very familiar with the pros and cons between Vista and XP. Which would you prefer?