Annoying "Tink Tink" sound...

[Charaid]

So I love Carbonite. I finally threw away my Questhelper cuz it pretty much sucks. Carbonite is amazing. My one and only complaint,which has forced me to stop using it, is this little "tink" sound that plays randomly, about 20 times per minute.

What is this and how do I turn it off? I'd love to keep playing WoW with Carbonite, but the sound is just too annoying to justify it.

I checked my headphones,
I checked my soundcard driver