Using my headphone,d person on d other side doesn't hear me.

Make sure that microphone is enabled (ticked) in sound properties.
Control Panel > Sound
Try to update the drivers on your PC. I found a good software for that, it's called Driver Pro, really helped.
If all else fails you can purchase a usb external sound card one of which is by a company called lindy just plug it in tyo usb and plug in headphones or headset with mic and instantly you get perfect audio.
I had a same problem. I did not know where the problem was. I updated drivers and for that i used Driver Pro. It really helped. And unlike other solutions,it is not so expensive.
