Restoring the msdb Database from Device 
Use
If you have used a full Windows NT backup to restore the executables disk of your system, use the following procedure to ensure that your msdb database is up to date.
Procedure
The Restore Database dialog box opens.
The Choose Restore Devices dialog box opens.
The Choose Restore Destination dialog box opens.
The Choose Restore Devices dialog box reappears.
The General tab reappears.
The list of backups on the tape is displayed.
The msdb database is now restored to the state it had at the time of the last backup.