Ok, to prevent Windows 10 from automatically installing itself on your windows 7 or 8 Laptop or PC, simply download 'Never10' and run it. It will inform you if your machine is protected already and there will be a button to click which will disable the Windows updates that automatically install, you can always switch it back on if you decide to install Windows 10 on your machine. It's so much easier that going through your Windows registry entries and deleting files. It really is an awesome bit of kit! MORE ABOUT THIS