weird pc problem i cant figure out.

Hmm. Perhaps you could try the speakers on a different pc/laptop if you have one? If you experience the same sound, it might be some problem with the speakers itself.

Watch your CPU activity to see if it spikes.

now i come to think about it this started after i updated to the latest nvidia driver. im going to roll back and see what happens.

that seems to have fixed it, cheers Lengray your post jogged my memory. i'll add this, i also noticed that mouse movement and scrolling web pages was jerky, thats gone as well now and it as smooth as before.

Most important when it comes to Nvidia drivers is to always do clean installation and not to use nvidia geforce experience. This program has once made my computer impossible to turn on. Yes, the program which major function is to download correct drivers to your particular computer and system has downloaded a wrong one and broke the computer. I only keep it to inform me that a new driver is out and download straight from the website.

could be graphic or audio drivers (update: saw you fixed it)
sometimes it's caused by Flash Player which you need to play youtube videos, (sometimes needs to be updated/reinstalled)

I've had this since forever, it's usually some driver's fault. Download a tool called LatencyMon, let it run for a few minutes and it will tell you what's causing high amount of DPCs.

I have the same buzzing sound when nothing is playing and the speaker volume is turned really up. Try turning op the sound volume in windows and lower the one in the speakers. See if it helps. This is due to the USB powered speakers that I have, with the ones that have their own AC power cable it does not happen.
Edit: Glad you fixed it. I was about to recommend the same thing with the nvidia driver next. :D