hmm only thing i can think of is opening up the mixer and muting all things not used (also drag bar all the way down as somtimes mute doesnt fully work *shrug*)
Main one being microphone port that causes issues. failing that does kx do drivers for the live, if so might be worth giving them a shot (
http://kxproject.lugosoft.com/index.php?skip=1)
not brilliant for games but rather good for general audio
K