Burning issues

I've just downloaded another album from Napster, something I've done many times before. This time, I am unable to burn any of my Napster library onto CD to play in thre car. The error message says that it could be incorrect media type or too high burn speed. I tried different disks and lowering the burn speed, neither of which does any good. Is it my CD burner or is it just napster? I can burn MP3 files to disk from Media Player still OK.

Any ideas?

Many thanks,

David