Hello! Is there anybody that has gone from Tiger to Snow Leopard and did this as an upgrade? Did all your music and pictures remain on your HD? Is it even possible to do it this way? When I put my snow leopard disc in my computer, it has 1 option which says: Install Mac OSX and if I press that it says, press continue to restart your computer and installation will begin (or something like that). It's not clear to me if it's gonna erase my harddrive or not. Anybody any advice or experience?