Help with microphone audio

In my opinion, Audio is a big part of “design” so I thought this would belong here. I have a Microphone headset, and I THOUGHT I would be able to record good quality sound, because the sound is good, but when ever I record my voice or something, there is an anoying “mmmmmmmmmm” sound that ruins what-ever audio I had recorded. I knw most of you are thinking “Just buy a new one” but the town I live in, the cheapest I can expect to pay for a mic, is around 200 pesos ( 20 bucks ), and since I just spend my last penny buying a graphic tablet, I don’t have cash. So I wanted to ask you guys if you knew of any ways to eliminate the static like “mmmmm” sound.