internal mic noises/headset won't work

Hi all,

I have a HP G62 

Program: Windows 7

Problems:

(1) Internal microphone volume is very low on skype and when I record myself, even though the volume is at the highest it can be. When I speak on skype using my internal microphone, I'm told I sound very far and there's background noises that make it hard for people to hear me clearly.

(2) When I try to set up my headset microphone, it doesn't pick up any sound. I also tried the sound recorder tool and it still doesn't pick up anything from my headset microphone (I can't set up the mic). The headset works on other computers.  

I've tried other tips from this site like disabling and reabling Realtex audio manager, turning off the boost, etc. Just for your information, the microphone icon is enabled and there aren't any problems with my speakers (I can't hear the background noises or anything from my speakers, only when I speak to others they can hear the noises and my voice sound is low). 

Thanks