Cannot burn audio cd

This is strange I am using roxio central and nero burning rom and they will not write a audio cd but they will write a data cd. Have two different burners and it happens on both of them I am running windows xp pro with one gig of ram have a 500 gig hard drive, it was working before but not now. Have uninstalled the programs and reinstalled. If you need more info let me know?

                          Thanks