thanks.
i might have solved it: although i had scrolled thru the page earlier looking for clues and found none, today i noticed new audio playing and scrolled down to find a video link open, that associated with the audio. I edited my home page to open without that video link, and on at least one restart neither the audio nor the vid has opened. I hope this solves it, and i mention this in case anyone else has the same problem.
i've had excite as my home page for years and have it customized to my satisfaction so simply abandoning it wasn't an attractive alternative.