So you're basically forcing your decisions on to her? You've forced your decision of not upgrading to the latest windows version. And now you want to go out of your way to not get her a laptop she would be happy with. All because you're not happy with what many would consider be a minor issue.

Since you're saying you've already talked about the privacy implications I'm going to assume your wife has made her opinion clear. Yet here you are trying to figure out how to get her to do what you want. Seems very controlling and generally controlling partners aren't healthy ones. Maybe you should seek some therapy (not couples therapy, just therapy for you) to help you get over this controlling urge you have.