Hell freezes over, MS Paint adds support for layers and PNG transparency
stopthatgirl7@kbin.social to 
arstechnica.com
Automated background removal was also added recently.
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stopthatgirl7@kbin.social to stopthatgirl7@kbin.social to
I recommend Krita, it's free and open source, and very good at making digital art of any kind.
The commenter you replied to literally wrote the computers are locked down, ie no way to install any new software.
https://portableapps.com/apps/graphics_pictures/krita-portable
There's a portable version that might work.
Locked down windows computers usually have app locker which would prevent executables.
I've never experienced this, I've only experienced that you cannot do anything you need an admin for, maybe the control panel and settings app were removed from sight.
Then you've never worked in a high security environment.