Are you sure it is for your CD Rom's and not your hard drive? Are you
trying to write CD's or does this actually happen when you insert say a
music CD? If you are trying to write a CD, you may be adding too much
data to be written. Most CD's can only write up to 700 MB of data. If
it is your hard drive, you may want to run Disk Cleanup, uninstall any
unnecessary applications, and delete any old junk/files that you no
longer need.