I had a similar deal, limewire was looking for a jvm and giving an error at windows startup, which is funny as its not set to do that. Seeing as i dont have msjvm, bit have suns jre i figured it was just confused, i worked fine. But i got tired of the error messages and restored back to 3.6.6. i expect that will be you best bet too. But its funny as sun java is on the limewire page and yet didnt seem to realise it was there.