You can only create Win2003 IDR disks from a Win2003 Backup Media Server, if creating from a BackupExec media server which is Win2000 it will fail.
IDR is so buggy it is easier to restore manually - alternatively if you have money to spend look at 'Bare Metal' restore program - but is pricey especially considering you may never have to use it, and I don't believe it intergrates into BackupExec at all well.
When running the Intelligent Disaster Recovery (IDR) Preparation Wizard "Error opening "\\SERVER_NAME\c$\Program Files\Veritas\Backup Exec\NT\IDR\disk1\51ASETUP1.EN_" The System cannot find the file specified." is displayed.