when I make a backup without the OBDR software, I can make backups. Everything

When I install OBDR software, I can make small backup(a backup of only boot.ini
for example) but when I backup more files, the CPU goes to 100% and BackupExec
hangs both when using the DAT drive as when using the DLT drive.

Compaq ML370
HP DAT 24i
Compaq DLT40/80
NT40 SP6a
BackupExec 8.0
OBDR 2.0 fot BE8.0
SSD 2.19a