Many years ago I bought a copy of Paint Shop Pro 5 (Very old now) and I found the CD it came on a few months ago, installed it on my desktop and since last week it's been on my SP4.
Lightning fast, crop resize, save to most file types that I can think of, does everything I want, I did update PSP in the past but I always thought 5 was the best and simplest to use before it got bloated.
I do have Photoshop elements 14 but normally lose the will to live before I can achieve anything, so PSP is my main editing tool again and I am so pleased I found that CD.
For just viewing I use the built in Photo app.