To uninstall Backup Exec 9.x download the Microsoft Installer (MSI) Cleanup utility, and use it to uninstall it if backup exec cannot be uninstalled from control panel.
The MSI Installer Cleanup utility can be currently obtained from the Microsoft Web site: http://support.microsoft.com/default.aspx?kbid=290301
You might like to call us if you would like to manually uninstall the software. You can call 800-634-4747 or visit support.veritas.com to get you local support number.
Regards,
Ashutosh
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.