Try going into your device manager, find your DVD drive. Right click on it and click uninstall. Reboot windows and let it redetect it. See if that helps, if not you can try + media. If a no go I would say its time for a new drive.
Do that! Give it a good whirl to see if you get anywhere. But that's an old drive seen there and too often those were extremely fussy on the blank media you fed them. In other words a real pain in...
