I have an Acer 4620z and my HL-DT-ST DVDRAM GSA-T20N ATA, just stopped working, I have checked the device manager and there is an exclamation point over the disc drive. I have tried to uninstall the driver and reboot, that did not work, I tried to update driver software and that didnt work either. It was working fine and just quit...Any suggestions? I am running Vista Home premium if that helps....Thanks