I reset my Lenovo G50-45 after some booting issues. Everything seemed to work fine, except for the fact that the Network Controller is not working. This is what I get when I click on the driver:
--manufacturer is 'Unknown'
--the driver is not installed
--Location: PCI bus 3, device 0, function 0

Plus, there is a yellow exclamation point next to the driver icon.

I can't access wireless, which I suppose is caused by the network controller not working, so I could not access solutions to this problem through the Web. Any help would be appreciated. I am not very computer savvy.