I have tested this on our home computers and it works great. Microsoft is pushing Windows 10 on people without their permission and breaking computers – making them unusable. Recommend.
GWX Control Panel
This is a free tool that can remove and disable the ‘Get Windows 10’ notification area icon on Windows 7 and Windows 8. Recent versions can also disable ‘Upgrade to Windows 10’ behavior in the Windows Update control panel and do much more. See the user guide at the Ultimate Outsider blog. http://ow.ly/Zy67v