Hi Jillian,
Did you follow Symantec's recommendation to remove a device from Windows/Backup Exec completely? If not, here's how you would do it:
1. Delete the library out of Backup Exec & Device Manager.
2. Shut down the library and Windows.
3. Remove the SCSI cable from the server, and start the server up.
4. Log on, and verify that there are no entries in BEX or Device Manager for your library.
5. Shut the server down, reconnect the library and start it up.
6. Wait 1 minute or so, and then start up your server.
7. You can then verify Windows sees the device, and that Backup Exec's drivers are loaded, along with Removable Storage being disabled.
I see you've loaded the latest firmware which is good. Lastly, which HP backup device do you have?