How can you copy a file in OS X Lion when it says it is busy?

I am trying to copy Photoshop brushes from an external hard drive. Photoshop is not running and I'm not sure why OS X says that the file is busy. Any tips or software suggestions?

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have you tried restarting and then copying the files again? – Nathan G. Jul 9 '11 at 18:25
Do you copy or move? – Daniel Beck Jul 9 '11 at 18:45
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