ok i think the problem is solved. Ill post my solution here incase anyone else ever has this issue, although i feel it is rare. First you need to download this driver, "realtek r203" from 3d guru.comhttp://downloads.guru3d.com/Realtek-HD-Aud...nload-2059.html
now you can try installing the .exe file. If that dosent work for your needs, ie you want a stereo mix channel in windows 7 so you can record what you hear then you will need to install the driver manually. To do this you need to first allow it to be done. Go to start, devices and printers, right click on your computer then go to device installation settings and click "no let me decide" and then "never install windows update" Once these are checked and applied you can install drivers manually by going to controll panel, device manager, right click on your device and then hit up date driver.
Youl need to extract the file from 3d guru to a folder(done by right clicking on the exe file and hitting extract files, note you may have to download winrar), then when updating the driver hit browse my computer then let me pick. Select hdx.inf and install the driver, restart and you should have no more buzzing noise, and aslo be able to see the stereo mix under recording devices. Hope this helps cody