Windows 7: Buzzing/hesitation playing media files

I've got the following setup:

ASUS M4A78T-E
AMD Phenom II X4 810
A-DATA DDR3 1600 RAM (3 x 2GB running at 1333)
ATI Radeon HD4350

I'm running Windows 7 RC1 64-bit

I'm having issues playing any sort of media file. Doesn't matter if it is a low bit-rate MP3 or a huge MKV HD file. The files play, but occasionally, it's like the computer hesitates/hangs very slightly and there is a noticeable audible 'buzz'. So for instance, a song or movie will be playing and all of a sudden, there will be a quick 'buzz' noise. The buzzes don't last but a fraction of a second, but they're very annoying. It almost seems like this happens when the machine is having 'multi-task', but I don't know why that would happen b/c I consider this a pretty fast machine capable of playing an MP3 while surfing the web.

Any thoughts?

Hello - did you ever solve your problem with buzzing noises? I'm having the same problem after installing Windows 7 on my Toshiba laptop.

Hi guys, did any one of you actually solve this issue?

I'm having the exact same problem and don't know how to solve it. It's explained here.

I have the same problem. I have spent that last 90 minutes researching this. Bottom line, there appears to be no fix. This looks like another example of Windows 7, my idea.

M49, It seems that my problem with the buzzing sound is gone now. I don't know what exactly fixed it, but when I did what I explained here that seems to have helped the most.

I know it doesn't make much sense, except if Windows 7 already needed to install something and did that without even asking me