What brand of media are you using. Use Nero CDSPEED to find the media code. You can also try to create a dvd using CDSPEED, then run a disk quality scan on it. Your problem could be hardware, it could be media, it could be software, it could be your burners firmware and the media you are using. Easiest way to find out is to start eliminating things one at a time. Start by posting the media code for your media. And, your Nero log would show potential problems as well. Just remember to remove your nero serial number before posting it here.