Download Equalizer APO: http://j.gs/FFK6
Paste this into txt file: Copy: L=R R=L
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Sorry for the video quality and method but i'm recording this at a internet coffee and my english was not that good at the time :))~
90% of the time it's because of your headphone, so i do recommended to replace the headphone when possible.
For anyone have not solve the problem, probably because of your hardware error or some software that you had installed conflict with the APO EQ. Best of luck!