I'm having the same problem.
I got the burner maybe a year ago, and all was fine. Then I didn't burn a CDR/RW for a while and when I tried recently it wouldn't recognize that there was even a CD in the drive, my Pioneer DVD-ROM drive reads 'em fine.
That I know of I didn't change anything...
I'm wondering about the IMAPI service that XP has... What should it be set to? Automatic, Manual, or Disabled?
Thanks a bunch