Did you know you can mess up your disk space by get Windows 10 downloaded without knowning? Because the pop-up "Get Windows 10" has several malware characteristics!
In several previous iterations of the Get Windows 10 upgrade prompt, closing the window using the x-icon was the only option to prevent the upgrade from being installed on the device.
Or you can give the said "Never 10" or "GWX Control Panel" a go, in time.
See complete story@ http://www.ghacks.net/2016/05/25/get-windows-10-malware/