I have a strange echo when listening to youtube etc. It is worse if skype is logged in. have restored system, no joy. Cannot find my way back to the sound scheme setup that shows 'stone room' etc. Is it in 'personalise'. Many thanks for help

Forgot to say, the echo is in everything now, even the clicks when you go forward and back a page. Have quit skype and it is still there, cannot listen to anything.
Should I restore system or can anyone tell me where to find that 'stone room' sound scheme, because that is what it sounds like.
Many many thanks to you..it is driving me nutso