Sony Ereader Touch - when I buy new books and add them to the ereader, ALL the library goes onto the reader. So instead of only having 90 books, everytime I want to add a new purchase everthing is added. I've tried deleting page by page but this is really time consuming. Any suggestions?

SOURCE: Ereader library won't open

Hi.

If you're using the Windows Operating System, the issue may be caused by the Data Execution Prevention feature in the Windows Operating System or if certain folders used by the Reader Library Software are corrupt. Please click on the below link and select the desired Operating System to get the troubleshooting steps.
If the issue persists, uninstall the Software and restart the Computer.
Next, disable all the active Software's (Firewall, Anti-virus, etc) in the Computer and reinstall the Software.
Also, please ensure to check the "Launch Software" at the end of the installation. This should resolve the issue.
If you're using the Macintosh Computer, uninstall the Software as per the below mentioned steps:
First, click "Go" and then click "Applications" in the Main menu.
Next, in the "Applications" folder, in the right pane, double-click on the "Utilities" folder.
Then, in the "Utilities" folder, double-click "Terminal".Now, in the "Terminal" text window, type "sudo /Library/ebookLibrary/uninstall-ReaderLibrary.sh". There is a required space between sudo and /.
Next, please press "ENTER" on the keyboard. A confirmation message will appear. Please enter your Password or leave blank if you do not have a user account password.
After the Password has been entered or left blank for no password, press ENTER. You will receive the message that the Reader Library Uninstall is finished.
Now, please click "Terminal" and then "Quit Terminal" to exit the Terminal application in the Menu.
Finally, close all other open windows.
Now, restart the Computer and reinstall it.

Note: Ensure that the Reader is not connected to the Computer while performing any of the above mentioned steps for Windows/Macintosh Computer.

SOURCE: Can I delete a book off of the Sony ereader PRS

how do i delete the books that come with the ereaderprs 300