I have had my Macbook for two years and for the past few months it has been getting increasingly slower. I do have Leopard, but I installed early in the year, so it is not the new OS X. When I was a windows guy, I would have to reformat the operating system yearly to keep windows functioning. I didn't think you would have to do it on a Mac, but this is getting painfully slow. When utilizing spaces and expose there is a noticeable chop. Opening up word documents becomes a chore in and of itself. Do mac's need to be wiped out and started fresh again like windows? The macbook is the 2.0 ghz intel core duo. Help please!!!