I have a custom version of Windows XP that I use when I setup systems on the side. Well I noticed it came with an upgraded paint program and I really like it. It's small in size, very fast, does not take a whole lot of space, and I like the translucent effects of the toolbars.
Check it out.
http://www.softpedia.com/get/Multimedia/Graphic/Graphic-Editors/Paint-NET.shtml 
