a) Do you get any error message when you try to upload/download books?
Currently there is no security update for Windows Media Player.
You can try the following steps. This may not be a resolution but a possible workaround. ( only if you get the following "error code 0×80070057: The parameter is incorrect for OverDrive media console ” )
1. Open “Control Panel”.
2. Open “Folder Options” and select the “View” tab.
3. Select “Show hidden files and folders”.
4. UNCHECK “Hide protected operating system files”.
5. In the warning message you receive, click “Yes”.
6. Click “OK”.
7. Close the Control Panel
8. Click the Start button. In the “Start Search” box, paste the following:
C:\Users\All Users\Application Data\Microsoft\Windows\DRM
9. Delete ONLY the following 4 files:
blackbox.bin
drmstore.hds
v3ks.bla
v3ks.sec
10. Close this window and open OverDrive Media Console.
11. Go to “Tools > Windows Media Player Security Upgrade”.
12. Once the upgrade is complete, try downloading a book.