Rick, I downloaded 4.0 from the website,http://www.getpaint.net, as you suggested. My Norton Internet Security says it has a virus. Even when I installed it anyhow and started up the program, I got a window with about 10 lines of error messages that started with "SystemBadImageFormatException".
Can you help me get Paint.Net 4.0 properly installed on my Windows 2 computer?