Please can you help? I have a Macbook Pro 5.3 purchased in June 2010 and I need to upgrade the memory as I have used half of one and three quarters of the other DMM. Please can someone tell me what I need to buy to upgrade and how I would go about installing it? My computer knowledge is poor! Does my information reside on the DMM? Would I need to transfer my information and how would I do that? As you can see I need to be real "Mac for Dummies" explanations! Thanks in advance.