Starting February 8, 2016, Microsoft will start upgrading users of Windows 7, Windows 8, or Windows 8.1 to Windows 10 through its "recommended" updates.
PC-Popper's GWX Removal Tool, which was initially created to remove the Get Windows 10 notification icon, has now been updated to also block the upgrade to Windows 10 that will now be pushed through Microsoft's "recommended" updates.
To use this tool, save it to your hard drive and click on it. Once launched, press the Remove/Disable button. Note: This tool contains no adware/spyware or viruses.