Problems with Mac OSX and Windows (Partition)

[CookieMonster]

The problem that I have with windows is that the speed doesn't increase when I press the button. If I try to do a fine speed increase it will work but if I press the regular speed increase it will set it back to 1x the speed every time. When I do a slow speed it will work as same as with the fine speed increase.

Now, the problem in OSX is when I increase the speed in a video it will work BUT after 1 minute into the video my speakers will pop even though they are off OR on. Now, I know you will blame my speakers but i tried recreating this problem in the Windows partition of my Mac by enhancing the speed using the "fine speed increase" to the maximum but couldnt get it to work so I can only assume that it is a osx problem with VLC when you speed up a video.

Can anyone tell me what to do?