I have a Macbook 3.1 Intel core 2 duo, 4mb, 2 GB memory, 800 mhz, my son tried to install Windows on it, and now nothing works. So I purchased a copy of 13-inch MacBook Pro, Mac os x install dvd, obviously, I got the wrong thing, so, I bought a retail copy of Mac Os X 10.6, I have tried everything, and still I can not get it to work. I keep getting the message "Mac OS X can't be installed on this computer". Did I buy the wrong thing again, or is it a partition problem since Windows was on the computer. Any help would be appreciated. Many thanks for your time!