Hi I'm running Windows Vista on a new 20inch aluminium iMac and about every minute I get a crackling sound that lasts for about a second. It's like the sound you get when your skipping sections in a video or tape. It doesn't matter what app I'm using, whether it's a game or just watching a youtube video it skips in the sound. I've reinstalled the boot camp drivers twice, then downloaded the newest Realtek drivers and no luck. It's not a hardware problem either as the sound works fine in Leopard. I also looked on the Apple Support forums and I have read lots of similar problems. Any help would be great. Thanks.