My suggestion would be to remove the 25 mb epub first, by connecting the nook to your computer and manually deleting the file from "My documents" (or if it's a B&N book, archive it on your B&N nook library on the B&N website. Then reboot. If everything works then, you will know which file caused the problem and how to get your other content back in case of another crash. You can then try to re-download the large file and see if it works upon retry.
It is possible the very large file on your nook got corrupted during the failed download which can definitely cause library problems.
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