I recently was given a Macbook 2.1, and am looking to upgrade it. It has Snow Leopard downloaded as the latest OS X, it has 1 GB of RAM, and 56/80 Free GB of memory left. I have a few questions, regarding cleaning it out. I've already deleted everything unnecessary, my questions are: If I buy 2 GB of RAM, does it replace my current 1 GB or add 2 GB? This is the exact RAM I need to buy, because I need to have 2 GB of RAM to download OS X lion (1 more GB than I currently have), is this a good way to buy it? How would I install RAM? I can't find any other place to download OS X Lion 10.7, other than This, is it safe? Is This a good place to buy a new battery? If you could answer any of the questions that would be great, thanks.