Dell Inspiron 17R N7110 reformatted

I have reformatted my Dell Inspiron 17 R N7110 It all went well but I cannot get the driver for the network controller to install. I cannot get hooked up to the internet.
in my device manager it still has the yellow sign next to it and when i click on details it says the driver is not installed for it. I have gone to dell entered my service tag but who knows what to download from there. service tag # is GKQTRA1 I need that and the usb one. Any help would be great as I use this laptop for my schooling which I am still in .

Thanks in advance.