Hello,
Please follow the below Microsoft document to register the dll file.
http://support.microsoft.com/?id=830575
Are you using AOFO to backup SQL? if yes then deselect AOFO while backing up SQL
Have to created a network logon account to access SQL?
Is the Backup Exec media server and the SQL server in the same domain?
Additional Information :
For information on the recent VERITAS Backup Exec security vulnerabilities, including links to the downloads for the necessary hotfixes, please refer to the following document:
Patch summary for Security Advisories VX05-001, VX05-002, VX05-003, VX05-005, VX05-006, VX05-007
http://seer.support.veritas.com/docs/277429.htm
Note : If we do not receive your reply within two business days, this post would be marked ‘assumed answered’ and would be moved to ‘answered questions’ pool.
Thanks.