I keep trying to burn a CD through Windows Media Player. I've done this before and have never encountered any problems but now every time I try to burn a CD a bubble pops up reading <<Windows Media Player cannot burn some of the files. To investigate the problem, click the icon next to the files in the burn list.>> I don't see any icon and I don't know why it can't burn the songs. Any suggestions please as to why it is doing this and what I need to do?

Have you tried burning something else besides what you're currently trying? May be a corrupted file in the current selection. Also this is a matter of personal preference, but you may want to look around for another program besides WMP to burn CDs.

Its possible that you don't have permission if they are something you didn't originate. If you don't have the DRM to go with the files then its not going to let you.