100% perfect Mountain Lion driver packages for laptops please follow my instructions step by step. note! don't care the driver packages names here, each laptop is okay 1st. install 'Acer_4750.pkg' with default chosen items, then reboot your laptop. And you will find sound can be used. 2nd. replace the 'Extra' folder with the contents in 'it168_B.iso'. after reboot, you can find your laptop with ML sleep without any problem. 3rd. install the 'Acer 4750G For ML Ver2.1.pkg' the chosen items shown as below. after reboot, you can find wifi, webcam, screen resolution, etc., can be used perfectly. then, enjoy your Mac life here. Finally, with my apple fami products shown here.