Issue in Vista

[qanda]This question is published in the hardware section for the Optiarc AD-7190A. Click here to view full specs.[/qanda]I have two DVD RW drives, the master one is Sony AW-G170A and the slave one is Optiarc AD-7190A. I have two operating systems, windows XP nad Vista Ultimate 32bit. In case of windows XP my both drives are working correctly. but in case of vista, both drives are not responding in anyway as i enter any kind of CD/DVD in these drives. Both the drives show the contents of the CD/DVD but after that my PC hangs and drives are not responding, if i put out the CD/DVD from the drives, the system becomes continue again. I have also updated the firmwares of both the drives. Please Please help me regarding thiis issue. Pleaseā€¦ Thanks & Regards Nasir