C00D11AB: Cannot burn files to CD
Windows Media Player cannot burn (copy) the selected files to the CD. To fix
the problem, do one or more of the following:
Clean the disc and verify that it is not damaged.
Select a slower recording (write) speed for the CD burner (recorder).
Try a different brand of blank discs.
Quit other programs.

To select a slower recording speed
On the Tools menu, click Options, and then click the Devices tab.
In Devices, double-click the name of the CD burner (recorder), and then
click the Recording tab.
In the write-speed list, select a slower speed.

Or, was it this error Code?
c00d11ba Windows Media Player error - FIND a Solution HERE in this article!
http://www.updatexp.com/c00d11ba.html

Burning CDs (Problems)
http://www.microsoft.com/windows/windowsmedia/player/faq/burn.mspx

Windows XP CD Burning Secrets
http://www.microsoft.com/windowsxp/using/setup/learnmore/bott_03september16.mspx

I have already tried slower speeds-same problem,but thank you

Whilst not necessarily a fix ...... try this freeware :

http://www.protectedsoft.com/download.php  (scroll down).

Personally I use Nero, its better and has more features, but you have to buy
it. BTW, which version of WMP are you using ?

Clt,
Jeremy