Privacy violations
Every time I reinstall Windows 10 on one of my physical or virtual machines (which is often), I feel compelled to go through every privacy setting, and set each one the way I want. There's a lot of settings, and they default to values that are much more invasive than I think they should be.
ShutUp10, from https://www.oo-software.com, helps pull back the curtain on this process. It helps you to see, and change, many settings that are normally hidden.
Pretty stressful overall.