Good evening. In advance I ask to forgive for transfer. I have a Lenovo Z570 laptop. Delivered to Lion 10.7.4. I ask for help with kexts

Characteristics:

Intel Core i5-2430M (2.4GHz)
DDR3 Memory 4GB
(Descrete) Intel HD3000 Graphics/Nvidia GT540M 2GB

I am the beginner so forgive please.