Your PC may update to Windows 10 if you don't pay attention
 

Microsoft really, really wants you on Windows 10. We noticed last month that it was downloading the optional Windows 10 updater whether you asked for it (and had space for it) or not. Now it's actually pre-ticking the update box, as Ars Technica re...

http://www.engadget.com/2015/10/16/w...e-pre-checked/