Strange Noise on PC...

[Spartan1000]

I have been recently experiencing a sound whenever I start up a game - Particularly Combat Arms (If anyone of you has ever heard of it), and the URL to the video that has the sound is here:

http://www.youtube.com/watch?v=SOvHJFes2cs

I was wondering if any one else has had the same problem, and/or, if anyone knows what this problem is and how to fix it. (Or, if it even NEEDS to be rectified)

Thanks