right i have the sound blaster live card and philips 5.1 surround sound. its been working excellent for the past few month, but suddnly the centre speaker and the sub wont work, i have checked they are plugged in etc. what could it be? the dovume controls etc are on the centre speaker and they all still work as well 
could installing other audo programs such as quick time change some settings or something?
could installing other audo programs such as quick time change some settings or something?