I have an Inspiron 5100.  I formatted a CD using Roxio so I can drag and drop files to it.  It worked when I first formatted it.  I am trying to drag additional files to it and it will either say, "Access denied" or this is a read only file- I know the files are not read only. I cannot copy, drag, or do anything to the CD. I tried erasing another CD and it said it was either damaged or dirty.  Is my CD drive messed up? What is going on?

Help please,

Scott