I have a Plextor CD-RW PX-W1610A, using WIN 2000 and NERO software. I burned files to the CD-RW and it worked fine. (The files I copied were from a folder on my zip drive that I had moved to my desktop.) I had been able to make changes to the files on the zip. However, now the files are on a CD when I try to make changes and save these files, I get a "read only" message. Is it how I copied the files, or something else?

I am able to make changes and save to my desktop, but I know this is supposed to be a much easier process, right?