Hello Arbym,
Thanks for using the Microsoft Answers Forum.
This problem can sometimes arise of the computer you are using does not have or does not recognize a compatible burning device. I will consider that you have checked your drive and have found it to be in proper working order. The next thing would be to check and make sure that you are not trying to burn too much data to the CD. If you have added more songs than what will fit on the CD then the burn button will be grayed out.
Give these suggestions a try and let us know what happens.
Judd
Microsoft Answers Support Engineer Visit our Microsoft Answers Feedback Forum and let us know what you think.