@ jastorino > i have a lenovo g570 (intel core i5<2.50 ghz>, 4 gb ddr3, 1 gb AMD radeon graphics). and now my mother os is win 7 (32bit), i want to use Osx Lion 10.7. as a Multi OS. The problem is that when ever i i'm trying to install lion 10.7.3 v7 touch pad or external mouse not working. For disable touchpad/m0use i'm unable to install this OS. i am a new user for Apple OS, i don't know what to do !! plze help me out & reply me the Right process.