When you say wont "play" what do you mean? What are you expecting it to "play"
Data CDs are just that, CDs full of computer data files.
Those data files COULD be mp3 music files, but unless you tell the computer what to do with them it will just sit there.
There is an "autoplay" setting in Windows which tells Windows what to do when a CD is put in the computer, maybe have a look at that setting.
Details here (or look in the Windows help)
http://windows.microsoft.com/en-gb/windows/change-autoplay-settings#1TC=windows-7