Windows: Microsoft really, really wants you to upgrade to Windows 10, but if you're a happy Windows 7 or 8.1 user, you shouldn't be forced to upgrade. Never10 gives you control over whether Windows will upgrade itself. The free utility from security researcher and developer Steve Gibson couldn't be simpler to use. Run the 81k program and click either "Disable Win10 Upgrade" or "Enable Win10 Upgrade". Never10 modifies the GWX (Get Windows 10) registry settings to prevent or enable automatic OS upgrading.
You'll need to be running a non-Enterprise edition of Windows 7, 8 or 8.1 for this to work. For some systems, you might need to get a Windows Update to be able to use Never10, but the utility will also figure that out for you and also install the update if necessary.
You can read more about the technical details behind Never10 here. Unlike GWX Control Panel, another tool used for the same purpose, Never10 doesn't install any software on your computer. It just works.
Never10 [Gibson Research Corporation]