I have no idea, but it sounds like an error you might get if the RAR was corrupt.
My suggestion is to try a different third party compression tool, like http://www.7-zip.org/
IF you get the same or similar results then you might have to consider that the file is damaged.
Where are the files from?, did you copy them from another PC or did you download the files direct from a website?, have you run a security scan on the files?.
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