I currently have mac osx 10.4.11 on my macbook and i used to have snow leopard, but i wiped my macbook and rebooted it from the disk that came with it. i have borrowed a snow leopard disk of my friend but for some reason it wont let me install it? i've tried completely wiping the macbook and installing it but still no luck. could someone give me an easy step by step way of getting it reinstalled without having to pay. thanks