I have converted a PP slideshow to html. it works fine from computers using
both IE6 and 7 from XP but the sound clips don't start when viewing from
Vista. I have set the site as trusted on a Vista machine and that doesn't
help.

One thing I notice, when I access the show from Vista, the "need new plugin"
bar shows and I allow it to install. But the next time I access the page, it
asks for the same plugin again.