It wasn't the OP using paint.net, it was jimbouk in the first reply!
It's true that for the OP's planned usage a nettop would do just fine: there are Windows options at similar prices too, e.g.:
https://www.ebuyer.com/810799-chillb...ystem-cbfuswap - Atom, 2GB RAM, 32GB SSD
https://www.ebuyer.com/791206-msi-cu...9s6-b09612-243 - Broadwell Celeron, 4GB RAM, 32GB SSD
So the question is really down to whether the OP would rather have the experience of building for themselves...