Chirping HD noise with XP

Hello,
I bought a Macbook about a month ago and decided to install Windows XP by Bootcamp partition. While XP works fine in my machine, I get a little worried about this chirping sound the (I suppose) HD makes when I'm using it. I decided to delete the partition and the chirping vanished a day after that, but I still had it when I was on Leopard during that time.
As a former PC user, I have grown accustomed to hear these sounds whenever my hardware is stressing out and I associated this with a problem with the HD or memory, because it usually appears after a couple of years or accidents. Now that after deleting XP and restoring my HD I don't hear this noise anymore, I am wondering... Should I install XP anyways? Would this sound -apart from being annoying- mean any harm to my computer?
I ask this because there's a few applications that I MUST run that aren't available for Mac (Audition, vvvv, etc.). Please, if you can, advice me on this and tell me if this is just paranoia or what. Thanks in advance.

@weksi,
You can try playing those videos using a different media player to see if those high pitch sound are caused by VLC. Do note that those high pitch sound could also be due to the video file itself. You can try playing the video file on another device or computer to see if that is the case.

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