Maybe this will help someone else out:
I was able to get WaveLab 6 to recognize my CD/DVD drive by running the asapi.msi installer. On my Windows XP Creation Station, this installer was found in the following path:
C:Program Files/Steinberg/WaveLab 6/Tools/Cdr/asapi.msi
Run the installer, reboot, then open WaveLab to verify the CD burner drive is recognized.
Many thanks to a poster on the Steinberg/Cubase/WaveLab forum.