I tried to burn an audio file of the type "m4a" using Roxio Creator 11. The file was accepted to the "drag and drop" area, but a message indicating that this file could not be written to the CD was posted. I have Roxio Creator 10 on a second computer. It burned the audio file with no problem. The first computer has a Windows 7 op sys. The second computer has Windows XT. What is the problem?