Problems with Dell Latitude E6520 drivers??

I have a Dell Latitude E6520 laptop. The computer began having issues when trying to log in. The screen would go black and just sit there with no response. Friend of mine did a system restore during safety mode networking able and I believe I lost all drivers for equipment inside laptop. Can not access a wifi signal, can not use a hard cable Ethernet connection to connect to the internet. I was wondering if someone else had the same restore done to their computer and if so if there is a place I can download all drivers and needed programs, info, etc., to be able to access the internet again. Unknown wifi card brand and need to know where I can find the wifi card brand

If that makes any sense at all. Thanks