有試過官網的67.03 Beta嗎?
http://www.nzone.com/object/nzone_d...p_2k_67.03.html
Release Highlights:

The issues that some users have reported seeing when using the GeForce 6600 GT AGP are due to a driver bug which causes 3D corruption when this GPU is used with certain motherboards, most notably SIS motherboards. The fix is included in this release.