Hello,
I solved my problem with the oranls10.dll file - maybe i can help you
On my Database Server there was besides the Oracle 10 DB still an old Oracle 8 database which wasn't active or mounted (!) There were only the oracle 8 files on the system and though i doesn't backup these oracle 8 files or the database with the oracle agent, my backup crashes.
So I uninstalled the oracle 8 Database with the windows utility for software installation, then I deleted all the remaining oracle 8 files on the system, I uninstalled the Remote Agent Utility, reboot the system, i reinstalled the remote agent utility and then it works without an error.
I think BE wants to check the oracle authentification, always, even if you want to backup files or the system state - that's my experience and i'm not really happy about