Complete Mystery Issue

So I have a very good surface level of networking knowledge, although obviously not a expert. I've had my own home network for years. Central router, 4 access points in 3 different outbuildings, several servers, etc. Last week, my laptop stopped being able to access the Wi-Fi. Other devices are not affected including my wife's computer (a couple of years old Dell), my kids (2 of them) computers, 2 laptops and a homebuilt older desktop, several tablets, all of our phones, fire TVs, and probably one or two things I haven't thought of. So, not unreasonably, I figure it is a problem with my laptop, an Alienware M18R2 with Killer branded network interfaces (Killer E5000 Gigabit Ethernet, Killer BE1750x Wireless network). I have: Checked the private/public status of the network (was private) forgotten the network on Wi-Fi, it is still saying it "Can't connect to this network" removed and reinstalled the devices/drivers Did a network reset (Settings->Advanced network settings->Network... Read more