If you override the value in DirectX, it will only apply to DirectX games, not OpenGL. The refresh rate 'fix' in SP1 did indeed work for me, but again, only in DirectX. I have an ATi Radeon 8500 and all of my DirectX games play with a refresh rate of 100Hz... make sure you check your display settings. Windows will NOT override the refresh rate specified for your monitor in the display settings. It will never use a higher refresh rate than the one specified there.
<font color=red> If you design software that is fool-proof, only a fool will want to use it. </font color=red>