One laptop is killing our wireless

When a specific laptop is turned on all other wireless devices lose their connection but when that laptop is connected to the router with an ethernet cable the connections are all stable. Typically when that laptop is connected via wireless we (3 other laptops and 3 iphones, occasionally more devices) all have connections dropped every minute or more.

I have tried updating the drivers on that laptop but they are already up to date, I've tried so many things that have been suggested but nothing seems to be working other than keeping it plugged into the router constantly which is not an option for us.

The laptop also shows 100% disk usage directly on start-up when nothing else is running. Sometimes stopping Superfetch and Windows Search will help but not for long and sometimes not at all, not sure if this is related to the problem but I figured I'd throw that in here as well. It's a Windows 8 Lenovo y580 laptop, only a couple years old. I have the exact same laptop for myself with Windows 7 and it's a year older with no problems.

I'm hoping someone has an idea of what to do here because everything is pretty much garbage once that laptop is connected to wireless.

It's possible that the device is flooding the network with wireless signals. I once enabled sound broadcasting in my home network over wifi and that made wifi network almost unusable. This problem didn't exits over ethernet because of the higher bandwidth.

Use a packet capture software like wireshark to see if this is the case. Actually on windows you can open the task manager and look at the network graph. It could quickly show you if lots of data is transferred. Then you can use a capture software to see what exactly is that data.

The suggestions to try a wifi dongle if the above doesn't resolve the issue is also good.