I'm not sure if it's been posted in the previous pages, but I've found a solution to the static noises that happen along with other sounds. I found it elsewhere on the internet (sadly I closed it so I cannot reference), and I thought I'd post here to hopefully help a few frustrated people. The same static thing happened for me in Windows XP, it was just so long ago that I forgot to bookmark the fix that worked for me.
I was getting the random "static" sound on speakers and headphones that seemed to be caused by CPU use. The sound was similar to if you were messing with headphone cord while listening to an MP3 player. This occurred when I did anything on my PC. Games, music; I could turn my speakers or headphones up and just scroll through a webpage and I'd get a static-ey chatter. Annoying, and seemingly loosely based on how much the processor was thinking about something. Seriously, even moving my mouse across the screen caused a tiny bit of hum.
Solution! In Windows 7, go to Control Panel-> Hardware and Sound, and open the Sound setting. Double-click on Speakers (that's what it was for me; could be different for different setups?), select the Levels tab, and find the PC Beep slider. Put this to 0 or mute it. Once I did that, all of my static sounds were gone!
Not sure if this will work for all. Obviously we have all different builds, manufacturers, and driver versions. I have an ASUS P6T and am running Windows 7 64. Like I said above, I had the same issue in Windows XP, and was so I knew there was SOMETHING that might work...just didn't know where to look. I don't know if this issue is caused by loose wires in my case or something, but when I did it in XP, I never had an issue again (until recently upgrading to 7). I have had no need for the "system beep" sound that I know of. I know if I'm pressing a key for 30 seconds, I guess? Someone may be able to expound upon how I must've messed up connecting a wire or how muting this might be bad or how maybe my case's system beep is dead/dying, but this fix got rid of my static and that's all I want.
Hopefully this'll help some of you. Just thought I'd put this out there. This thread and another seemed to be a nice repository of a handful of solutions. Good luck!