I just found that my guest computer in the lobby of my office has a screen that said "Welcome to Windows 10". I never asked for or initiated such this operating system switch. It was done entirely without my permission by a bit of malware Microsft has introduced to Windows 7 computers. I have had malware issues in the past, but never have I had one that A) put unwanted advertisements on my desktop every day and B) changed my entire operating system without my intervention or approval.
Thank goodness I read somewhere that one can avoid even this seeming fait accompli by declining the terms and conditions. Which I did -- hopefully the computer is rolling back right now.
I am very worried that my 30 or so field managers, who have poor computer skills on average, will get their computer upgraded without knowing it. I do all the tech support in the company and have no desire (and since I don't know windows 10, no ability) to support another operating system right now other than Windows 7.
I will double down on my recommendation of the free GWX control panel to remove this windows 10 upgrade malware from computers. It has worked fine for me (except of course of computers like the one above I did not even think about).