I install tomorrow a CDRW in my computer.
I need of the codec wav-mp3.
The mp3pro NERO of the my computer is demo.
Can you help me?

Go to CNET.com and download dbpowerAMP - its free! and then you can download various codecs to convert mp3, wma, ogg to WAV or rip CDs. Once converted NERO should be able to burn even though its a demo (i think)
Try it!