Check the NoteSkins folder and see if the installer screwed up and made it empty.
It should have folders like beat, common, dance, and so on inside it, then the actual noteskins inside those.
If the NoteSkins folder is empty or doesn't existed, it wasn't installed correctly and you can try installing it again.
If it's there and has stuff in it like it should, then something else is wrong.
< cybik> til Kyzentun fixes bugs for breakfast
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< maxvg1> shakesoda: then why do i still play lol
<@shakesoda> because you're an ITG player. And thus, a masochist
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<@shakesoda> Kyzentun: I think you might need to put down the meshes for a bit