Here is my recap of what others have said that I agree with:
--The best way to get Win7 on your computer is to buy a computer with Win7 factory installed. I believe Dell also still sells some models with Win7.
--You can still buy a Win7 disk and install it on your computer yourself. If it is a new computer there may be some bugs with the drivers for things like graphics, wifi, etc, that will not get solved as quickly as they would on Win 8.1 or Win10. And you may have to deal directly with the individual part mfrs for these drivers and updates.
--Win10 can be configured to ALMOST stop spying on you and ALMOST stop upgrading without your permission or knowledge. Many people (not me) feel that is good enough.
--Each OS version is somewhat better than the last. Even Win8.1 has things that are better than win7, although a LOT of work is needed to get rid of the demented GUI.
If I was in the OP's position (and I was six months ago), I would widen my search to include Win 8.1 machines (factory-installed), IF IF I was also condiering a self-install of Win 7. The fact is that configuring win 8.1 will still be easier and likely more successful than the effort required to get a NON-factory win7 up and running.
I love win7, but as Fate would have it, I'm running two machines with Win 8.1 and none with win7 anymore. Now that I've turned off 99% of the cr@p, I like it better than win7 99% of the time. But once or twice a month I'll accidently drag my thumb across the touchpad and out comes the charms bar and my blood pressure starts spurting through my ears--ARGHH!
