Exchange 5.5 recovery and Bent 9.1

Exch 5.5 Sp4/ Win2K Sp4/ Bent 9.1 with exchange agent and IDRBackup set includes all drives and online exchange, but not mailbox backups.When trying to restore, the restore run sucessfully but exchange will notstart - error C8000212 on the IS.Has anyone come across this before and found a fix?Many thanksOJ