Sounds like the burn laser for the DVD side has failed, I had this problem a few months ago and simply replaced the drive with a new one. They are cheap and easy to install. Simply remove the old drive, note the jumper setting and set the same on the new one, slot into place and re-attatch the cables. Re-boot and windows should find new hardware and you will be up and running. Took me all of 20 mins from start to finish.