Windows 10 automatically got upgraded/installed. What would you do if you are forced to install windows 10 without notice

My windows 8 got suddenly restarted with multiple unsaved documents closed. It was a disaster

After a long time restarting again and again, windows 10 popped up a window to let me decide whether to agree or decline the new agreement and embrace the new world. If I click decline, I will lose %@&$*Q^*W((..... etc .

So I googled around and
found this answer here:
http://answers.microsoft.com/en-us/windows/forum/windows_10-win_upgrade/windows-10-upgrade-is-at-the-installation-point-if/49e7c0ae-a884-4294-9fab-7dda42ef7033?auth=1


Basically you decline their terms & conditions and you'll get restored.