Echo and feedback on sound.. help me

[chinaDOTone]

Hello guys... last week my sound is good while using mic but now what ever i do i cant use my mic properly.. I cant talk to someone clearly. They hear echo and feedback and i hear it too. Im wondering what happen if my sound are the one whose having problem or my headphones. I tried to change headphones and even use my camera mic but still same problem. I tried to uninstall my driver and even update it but still same thing. Please someone help me with this thing. I dont know if reinstalling it will help cuz after reinstalling it same setting i got after that. pretty please help me