Hi All,
I run a Dell Desktop with Windows 8.1 which I can get along with OK.
Came into my office yesterday morning to find that it had installed Windows 10 without my knowledge or permission and only by declining the user agreement did it EVENTUALLY restore my OS to 8.1
I Googled 'how to stop this' and turned off the required item ( GWX) in the task bar preferences but just now came in to find that W10 was downloading again, managed to stop it but am now really worried it will happen again when I am out.
I am sure that I have software that will not run under W10 and am terrified that it will screw up my important files, some of which are very old. I have backed up regularly using Norton but I really don't need this stress which is not of my own making. Bloody MicroSoft! 
Can anyone please tell me how to stop this happening for once and for good please?
Martin