the drive in the advent laptop will play audio cd's but will not play a dvd or write any dvd or cd. It does not recognise any disk other than an audio cd being in the drive. Can anyone suggest further steps to take. Vista home premium - it used to work ok. Steps already taken: 1. uninstall dvd drive - reboot - found and installed but still the same. 2. Upper and lower filters deleted in registry. 3. Updated drivers. Still does not work. Seems strange that the audio cd's still play fine.