GIMP for Windows is much more than an image editor - it gives you most of the features of Adobe Photoshop, completely free
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GIMP (GNU Image Manipulation Program) is a superb free alternative to Adobe Photoshop, and comes with a huge array of professional-quality functions for fine-tuning images and photos, and creating your own artwork from scratch.
It includes layers, highly customizable brushes, filters and automatic image-enhancement tools, and support for a huge number of plug-ins.
The latest release introduces an optional single-window mode, so you don't have to deal with multiple images and toolbars each in their own window. You can navigate between different images using tabs.