I have win10 machine that I almost never boot. The only reason I still keep it is
200 steam games on it. When in play mood, mostly play Skyrim and The Forest.
What I use every day is a dual core machine. I have 8 of them. They are cheap
and fast, and perfect for backups to last forever.
On this dual core machines I run windows XP, it is small, simple and fast.
It can do everything I need .. e-books, movies, office, development.
What cannot do is internet.. not safe.
For internet I have dual boot setup.. after many trials, I settled on basic debian/LXDE
One machine cost me 30 euros complete with monitor and they are quiet, perfect for
study.