How existing Windows users can refuse Microsoft's Windows 10 update:
http://www.zdnet.com/article/how-existing-windows-users-can-refuse-microsofts-windows-10-update/
"If you don't want Windows 10 to install automatically on your Windows 7/8 PC or tablet, for whatever reason, here's what to remember":
Note! Grc.com got a tool to turn off Win10: https://www.grc.com/never10.htm
