Hi,
We apologise for the inconvenience caused because of the delayed response. Please let us know if your issue still persists. If yes, please refer the steps mentioned below.
-- Stop all non essential third party software and Antivirus software services (Norton Antivirus) prior to installation.
-- Run the setup.exe frile from Winnt\install\VxSDM directory and choose repair
Once repair is successful, please run the installation of Backup Exec 9.1 setup again.
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
http://support.veritas.com/docs/278434
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.