A question from my brother, but I haven't messed around with such an issue ever, so I don't know what could have caused this 
A few days ago, His folders stopped making noises. When he opened "My
Documents", it should make that clicking MS folder-opening sound. But it
doesn't have.
Btw, the same noise also stopped in IE7 when he try to open a bookmark.
Any ideas on how to fix it? Ur inputs are highly appreciated. Thanks in advance. XD