Jube, CD's Tend To Do That...
The simplest fix, when you're ready to use them, is to copy the files to your desktop/hard drive, then change the properties of the files while there. (RIGHT click on the file, choose "Properites", UNCHECK the "Read Only" box, then click on "apply", OK, etc.)
Because formatted CD-RW disks are not a reliable method of making backups, (it's a problem with the general make-up of packet-writing software) they tend to create issues sometimes. Formatted disks are great for temporarily saving or transferring files but using them as permanent backups isn't wise. If you're going to use formatted disks, BE SURE to have a secondary backup CD which contains the same data.
It's better to simply resign yourself to editing files while on the hard drive then copying them back to the disk.
Hope this helps.