Sorry I couldn't be more specific with the title...
Anyway, iTunes looks like this:
...and Windows Photo Viewer looks like this:
I haven't seen the problem anywhere else, and I have no idea what's causing it. Can anyone help?
I don't think this can't be a monitor issue (since you can copy and paste and we can see the green).
If that fails, I suggest you update the drivers for your graphics card/device. Some times the chipset drivers can help as they bundle all sorts of goodies in there.