I did a custom reinstall on my dell latitude e5420 laptop using dell windows 7professional 64bit sp1dvd and now my wireless network is not working. I tried turning the switch on and off, restarted my laptop, and I also went to dell suport and downloaded all the recomended drivers and it still doesnt work. I dont know why its like that and I really need help with it.

I went to device manager and noticed that under "other devices" there is a yellow exclamation mark on the network controller.