sound problems hdmi

hi

i am having some issues with sound.
i have just performed re install of vista and re-install drivers to check if that would fix the issue but it has not.

the issue is that i have an hdmi out on my pc for (video and audio) and a headphone jack (for audio) i get windows sounds independently through headphone jack when headphones are inserted as i shoul, the issue is with the hdmi i only get windows sounds when windows media player is open and playing a video or music track? or when you tube video playing. as soon as i stop wmp or you tube i no longer get windows sounds.?

eg paying wmp video remove usb i hear the device disconnect "bing bong" close wmp and insert or remove the usb and i dont hear the "bing bong" no uac tones
i have tried setting as default device etc etc nothing seems to remedy it?

i will include some screen shots below to aid in diagnosis.. if any more info or screens etc are required to further aid in a diagnosis just let me know thanks in advance to anyone who can help solve this issue..