Acer e lock activated?????????????? HiHave had my computer for nearly two years and just recently

Question

HiHave had my computer for nearly two years and just recently have been getting this messageOptical Drive Device LockedAcer e lock activated.Feeling a bit of a failure as I don`t know how to get rid of this or sort it out and now my cd is not working ( access denied).Still under guarantee but as I am sure this is just a case of finding the "right button" don`t want to trouble anyone.Anybody got any bright ideas.Help apreciated.Thanskmargaret