NOTE: DAEMON Tools V4 also uses SPTD (SCSI Pass Through Direct) driver to access cdroms and it is also automatically installed during DT setup. But SPTD is not removed during uninstallation because it may be used not only by DAEMON Tools but by other applications as well and its removal may disrupt these applications.
Nevertheless, if you suppose your problems are SPTD releated you can remove it as specified in this thread