Why does my thumbnail turn blue?

I'm running on Windows 7 Ultimate 64-bit build 7100,

In Windows, you know how you can rotate a picture and then hit the editor option which takes it to something like Paint, and crop two sides? In order to crop all four sides, you crop 2, save it, turn it upside-down, crop the other two, save it again...

By this I mean can I turn the thumbnail into a full picture?

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