Yes, as posted above, the GIMP is an excellent open source alternative to photoshop and runs on Windows.
You also should look into the cygwin project:
www.cygwin.com, a lot of great unix/X software ported to Windows, and is an excellent baby step into getting into a unix/linux environment.
[The name should be familiar, all of you using shntool on Windows needs cygwin's dll file.]
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