Am running windows xp and have been backing up data on cd-rw in E drive. Suddenly when trying to update, discs read write protected and read only. I cannot even read info on the discs now. Just installed nero and uninstalled casio 5 which was not working to record on cd-r. can you help me and if you can please explain as clearly as possible. Am 80 and don't understand all the current computer language. Thanks.