It sounds like you've had a catastrophic failure of your only Active Directory Domain Controller (DC). Presumably you have some kind of backup since you mentioned "BKF files".
Ideally we could have troubleshot the "crash" that you describe, however since you've already attempted restoration it's likely that you've damaged the operating system so much as to render troubleshooting useless.
Ideally you could set aside the hard disk drives in the server computer and perform your restore activities on fresh disks so that you have the option to attempt to recover files, etc, since the backup was last performed from the old disks. If you don't have that option then consider making copies of the disks in the server computer to a safe location before you proceed.
If you have a full backup of the DC's operating system AND the System State you can perform a bare metal restore of the machine. You would start by installing Windows Server 2003 on to the server computer. I'd format the disks and start "fresh". Once Windows is installed you can use NTBackup to restore the backups you previously took, including the "System State". Once you have restored the backup you will need to reboot the server computer into "Directory Services Restore Mode" and restore the System State again to restore Active Directory.