A CD-RW disk is like a big floppy, and there are various ways that you can use them.
At this time, like the old days of floppy disks, CD-RW disks work best when formatted by the drive / software you will be using the disk with.
Perhaps, as thetechnology matures and standardizes, we will be able to buy formatted CD-RW disks.
As to the errors, are these 700 MB or larger disks?
Many of the older drives / software packages do not support the higher capacity disks.
Check for software updates, or a firmware update for the drive.
It is also possible that part of your CD burning software package has been lost, or been corrupted. You may need to re-install the software.
Chas