Upgrading to Snow Leopard: Click install, come back 1 hour, put your name, done. Upgrading to Win 7: Install 3 updates, install 17 updates to update the last 3 updates, the updates could not be installed “Unknown Error”, Run Win 7, Would you like to upgrade or install from scratch? Upgrade, “Sorry, you can’t upgrade, u can only install from scratch” unless u install these other 13 updates. Facts speaks for themselves