I bought a **USB SpeedLink SL-8707-SSV Pure Voice** microphone.

When I record with it (audacity / windows sound recorder) it records a terrible **scratching** noise:

![alt text](https://i.stack.imgur.com/eNp6T.png)

I've looked for **drivers** but on the [company's website](http://www.speed-link.com/?p=3&cat=184&pid=2570&paus=1) it says: 

> 
> Microphones don't require drivers.
>  They will be configurated in the
>  settings of your sound card.
> 
> 
> 

My computer:

* **P5QL PRO** Motherboard (I assume the "audio card" is on the board)
* **Windows 7**

I've experienced **no other sound problems** with the audio.

This is my **first USB microphone** (I've had always used the jack plug microphone). 

**Is there something that I don't know about USB microphones or is this particular microphone just defect?**