I was told of paint.net because I needed to make a gif transparent. That worked fine so I thought I'd explore paint some more. However, I can't seem to make anything work. The eraser does nothing, recoloring does nothing, I can't get new photos to go to a new layer, on and on. I'm opening pictures in the jpg format - is that the problem? Is there something more I need to do to activate paint?
I'm using Windows 7 Home premium on a one year old HP desktop.