em174457,
The RW CDs have to be completely erased before they can be reused. Here's
how. When you insert the CD, a little window should pop up in the center of
your screen saying that it detects whatever files are on your cd, then under
that a list of choices of what you want to do. Scroll down until the bottom
and you will see "Open folder to view files". Double click that, and the
contents of your CD will be displayed. If you didn't change any settings,
there should be a blue vertical pane on the left of the window. Under the "CD
tasks" section, there should be an option called "erase this disk" or
something like that. Please keep in mind that only if you insert an RW disk
then that will appear. So you click on that and a wizard for erasing disks
will pop up. Follow the instructions from there. I hope this helps, *_*