I had this issue and went through a bunch of drivers to finally get it right.
Sims2/BF2/COD4/Oblivion all work now without static in the background.
Download Realtek 1.82 HD drivers from here :
http://downloads.guru3d.com/downloadget.php?id=1784&file=8&evp=3d1a0efec797587f5ae91d49f95253ca
Self-extract & install
When it prompts you to remove the original drivers, click Yes.
Reboot.
Re-install the Realtek 1.82 drivers you downloaded (again).
Reboot.
No static.
Without doing the double-reboot/double-install, it didn't work.
Jesse
Sims2/BF2/COD4/Oblivion all work now without static in the background.
Download Realtek 1.82 HD drivers from here :
http://downloads.guru3d.com/downloadget.php?id=1784&file=8&evp=3d1a0efec797587f5ae91d49f95253ca
Self-extract & install
When it prompts you to remove the original drivers, click Yes.
Reboot.
Re-install the Realtek 1.82 drivers you downloaded (again).
Reboot.
No static.
Without doing the double-reboot/double-install, it didn't work.
Jesse