Aopen duw1608/arr burning nightmare trouble

Hi there,
I have a new Aopen duw1608/arr dvd writer.
I am only able to burn with this drive if it is the only one installed on my computer.The moment i connect an additional drive to copy from i get this message every time'D: AOPEN DUW1608/ARR(LOGICAL UNIT COMMUNICATION FAILURE - HARDWARE ERROR"{04/08/03"
I have tried every conceivable jumper settings,changed the ribbon cables,tried different burning software,tried different copying discs,installed the latest firmware from the manufacturer's site,changed the cdrom that i have been trying to copy from but yet still the same error message.When i install the dvd writer into another computer it works absolutely great but fails time after time in mine.
I am using xp pro on a Pentium D-2.6ghz with 1gb memory.I would be very grateful if anyone could suggest anything here as the amount of man hours spent now is crazy and i have run out of avenues to explore.
Kind regards,
Yorkermiles/London.