You are using Creative Soundcard and software?

As per Windows XP Tweak Guide:

Creative Service for CDROM Access
This service only exists for those of us with Creative soundcards and software. I found it nothing but annoying and later I uninstalled all non-driver related Creative software entirely. If you use their Disk Detector (for some bizarre reason) leave it. Otherwise, disable it. A word of warning, Creative installs Disk Detector by default and sets it to Automatic. Make sure to disable it in the Creative menu first before killing it here. Default: Automatic