Hi!
You can try a hard reset to start all over, or probably a book inside your reader may be corrupted. You can try a hard reset:
Note: All data will be deleted and you will need to transfer all your content, if from Sony, do not worry you can redownload the books at no cost again.
1. Make sure the reader is at least half charge (If you are not sure, connect it to the computer for 15 minutes and make sure there is a redlight at the top)
2. With the reader disconnected from the PC, hit the reset button at the bottom of the reader for 5 seconds
3. Release the reset, and slide the power swith, the scree will blink and will shot "Opening Book..."
4. While the reader shows "Opening Book" press and hold the zero "0" and the down arrow until "RESET ALL" appears on the screen
5. You will be prompted to press the number five "5" to agree
6. Press the number 5 and the reader will go blank, turn the reader on again and this time allow it to load
7. Transfer you books again
Hope this helps, Good Luck! =)
eBookBoyhttp://digialreader.freeforums.org