Mr C has advised using the LAV filter package with AVStoDVD. I would remove the Klite codec package immediately.
Uninstall AVStoDVD and reinstall with your regular settings and the included LAV filters. I advise using a two pass encode with the HC encoder at all times.
Once you have your preferences set up, go to Codecs at the top of the main window in AVStoDVD, then Preferred DirectShow Codecs Setup. Set everything to LAV filters.