this was on the microsoft site.....
this is a copy and paste of what another user of vista did....
Quote.........
This fixed my problem for sound not coming through speakers in windows vista, Go to start, Click control panel, then choose hardware and sound,Then choose sound,Under playback there should be a green check mark on the Realtek High Definition Audio,and should say working. Click once on the speaker picture,Now choose the option configure in the bottom left of window pane,then from the options pick quadraphonic,then click next and make sure that the options front left and right and surround speakers are checked,then click next and finish.Hoped this helped someone
end quote.......
and this is a link to the updated driver ....
http://www.realtek.com.tw/downloads/...&GetDown=false
hope it helps
fred