I placed this here because it seems more relevant than the Win10 spot. But if the moderators disagree, please move. It is equally relevant in the Windows 8 spot as well tough it effects far more Win7 users (who are in greater numbers).
Confirmed: How to stop Windows 10 forcing itself onto PCs – your essential guide
by Iain Thomson
The Register
Jan. 8, 2016
…. Microsoft will start pushing out a Windows 10 upgrade as a recommended, virtually mandatory, update very soon …. It’s actually rather easy to turn off the Windows 10 upgrade function without losing vital regular software updates. Microsoft even has an official document explaining how to do it….
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[*]Open the Registry Editor (search for regedit in the Start Menu and run it).
[*] Set DisableOSUpgrade to 1 in HKLMSOFTWAREPoliciesMicrosoftWindowsWindowsUpdate
[*] Set ReservationsAllowed to 0 in HKLMSoftwareMicrosoftWindowsCurrentVersionWindowsUpdateOSUpgrade
…. [url url="http://www.theregister.co.uk/2016/01/08/windows_10_upgrade_blocker/"]Read the full article at this link[/url] Article includes automated script links for those who are uncomfortable editing the registry and comments for corporate Windows users.
If you have used GWX Control Panel it has already made these two changes for you. I confirmed this.