When I search for pain, it brings such joy
What is it that I seek?
While Macs bring me displeasure, I cannot find what I'm looking for
The puzzle is about MS Paint.
On a default Windows installation, MS Paint is the first result when typing "pain" into the search bar. A fairly well known PBS art series is "The Joy of Painting," with Bob Ross. So, when searching for "pain" you instead find joy, through painting.
This doesn't work on an Apple/Mac computer, because they don't have the same default programs.