I have a Lite-On DVDRW SOHW 1633S and a Lite-On DVD SOHD-167T. I have been trying to burn music from Nero Express and neither will write to a disk. I used the Microsoft Fixit diagnostic tool from the website but both instances tell me the drives are not capable of writing. Could both drives be defective or could it be something in the configuration, or maybe I'm not using the right diaks. I am using CD-RW disks. Any help is appreciated.