I have backup exec 4.4.1.

I have a pentium computer with an old ISA AHA1510A SCSI card. and DDS
Seagate tape drive. WIndows 2000 Pro. If I use the backup program which
came with windows I can do a backup, a verify and a restore and it works

If I use Backup Exec, it says backup device not found and stops the process
I started

Any ideas