Block Microsoft’s new stealth Windows 10 upgrade

Save the following text as “block-win10.reg” and double click to run it

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\GWX]
"DisableGWX"=dword:00000001

[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate]
"DisableOSUpgrade"=dword:00000001

or download the file directly:
http://program.tiger-workshop.com/blog/block-win10.reg

Reboot after run. Yeah. That SHIT is gone!

Source: https://support.microsoft.com/en-us/kb/3080351