I have been using the FastStone image viewer for years. It's free and you can resize photos, crop and add text and also change photos from one format to another. If I can figure out how to use the damn thing anybody else can too.
Most all of the pics & screenshots I post go through PAINT... Crop, add text, circle items, etc... Save as JPEG in "My Pictures"...
Only thing missing for me is "rotate x%" and "change colors".... compared to the fancy programs...
Resizing can be done on MSFT, but it tends to be a multi step process as Dacrunch outlined. It's nothing short of a PITA!
There are many extra snippet programs you can add to MSFT to get the job done.
It's why I use the Mac. I know both platforms and for my money the Mac is a well thought out experience.
Yes, it costs more, but it's a one time expense. APPL takes care of you from that point forward. There's no 'missing' rotate and change colors. It's all there. "Somebody" was actually thinking when they designed it.
The only reason to use MSFT is if you have proprietary software... some kind of architectural, or engineering type of ware that only comes in the flavor of MSFT.
PC's are like cars where you'd like to have electric windows, but that costs extra and needs constant maintenance. Something is always going on that needs 'fixing'.
I've been known to post an occasional picture here. My shots start as an 80 MB RAW file out of my camera. I post them here using 1 of 2 methods to reduce them to a few hundred KB. About 1/2 of them are reduced using Faststone as described by Irons above. The rest are links to an online photo storage site where I keep a lot of my pictures. I use flickr but there are others.
Below, an 80MB file reduced to 166KB using Faststone and stored in my computer. Despite being reduced to .2% of it's original size, it's maintained image quality.
If you're using win7 I'll recommend a totally easy to use resizer that I've been using for years. Just right-click one or more files in file explorer and select resize. I don't know if it would work on win10. It doesn't claim to.