Hi Chris,
The best way to update the Backup Exec MSDE Instance with SP3a with security fixes is to upgrade your installation to Backup Exec version 9.1.4691. This is a free upgrade from 9.0. You can download 9.1 from this link here:
http://seer.support.veritas.com/docs/264658.htm
Its would be a good idea to update Backup Exec with Service Pack 2 once you install 9.1. Please let 9.0 be installed on the server. With its services running, run the browser.exe in Backup Exec 9.1 installation files to start the installation. Setup will detect that this is an upgrade installation.
You can download SP2 for Backup Exec from here:
http://support.veritas.com/docs/275247
Hope that helps!
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