Steelseries Siberia 200 Microphone problems

I just bought the Siberia 200 headset and my audio is fine but the microphone is being weird. (I'm using Realtek btw.) My microphone sound is very low even when I boost it up to +30dB. And while voice recording, the sound is very low and sometimes out of nothing it boosts up and it becomes to loud almost like I yelled, which I didn't. It sounds like someone is speaking and spitting in de mic at the same time. I hope someone could help me solve my microphone problems.