Audio can be heard from headphones and speaker together?

Hi,

I have a HP probook 4530s with win 7 Home premium 64 bit. Till yesterday i was able to hear sound only from my headphones but today when i started my system i was getting sound from both my headphones and speakers. I tried re installing my drivers and all but still the same issue. Kindly let me know any other solution for it.

AND YES I AM HAVING IDT High Defination Audio CODEC DEVICE


THANKS IN ADVANCE.,..