I need to repair my hard drive but the Disk Utility won't work. I found out that I can insert the disk it came with and install the OSX and then run disk utility and do the repair.[I think it's called doing a clean install] So I insert my disk and try and install the OSX and it's telling me I need to erase everything on my computer and then I can install it because there's a newer version on OSX on it.[My MBP is 2 years old so I think I have Leopard or Snow Leopard] Is there any way I do it without having to erase everything? If I do end up having to erase everything would it be possible to put it all on my Seagate, that currently is holding stuff from my PC? How do I do that?