I have been encountering the same problem for some time now.
I have installed a SCSI IBM Ultrium Tape device, on HP Proliant ML350 G5 having Symantec Backup Exec 11D as the backing up on Windows 2003 STD .
during the backup the server just randomly restart . showing the attached error,
i have tried to update the drivers of the Tape Device, but the Backup Exec wouldn't recognize it anymore.
and if i disabled the ASR the server would just freeze.
is there another solution or ideas how to solve this issue