GIMP for windows is great, you may want to note that you need to download gtk first...

Both downloads avalaible for windoze here: http://gimp-win.sourceforge.net/stable.html

(plus help and animtion extension if you want to d/l them)

If you decide to use GIMP, there is pulg in called PSPI that then allows you to use all your photoshop plug-ins.....

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Toolset: Blender, GIMP, Indigo Render, LuxRender, TopMod, Knotplot, Ivy Gen, Plant Studio.