Alienware 15 R2 Connecting to Wifi kills entire network

Good trouble-shooting on your part to try a wired Ethernet connection and verify it works.

In the old-days, I would never have believed that a computer connecting to a WiFi network could kill or reset a router. However, users have been reporting that here for years. I remember about 5 different threads over the years (maybe those are still online here ... I posted tips in all of them).  They always have Killer Networking cards.

I think this is the most recent.

https://community.dell.com/message/65207

I think you have 2 options:

1. Repair Killer Networking card and/or drivers

https://community.dell.com/thread/24308-wifi-connectivity-15-r3

1a. Some users end-up swapping Killer Networking card for a similar Intel card (candidate must use same internal antenna config).

2. Carefully reprogram router and/or computer to use different WiFi paramaters, Frequencies, and/or actual AccessPoint (if it has more than one). Try to limit speed or otherwise control the connection it establishes. Try to "work-around" the problem but still allow other devices to work on the router's WiFi. My guess is it's over-driving the router and it's over-heating and rebooting, but it could be something else causing the router to get confused . It's strange it doesn't just disconnect the offending machine.

Hi thanks for quick response just want to know is this intel wifi is inbuilt  in my system or I have to purchase it from somewhere. If I get it how to uninstall killer wifi driver and install new one