Red,
The only advice I can offer you here, is make sure you have the exact driver for your card, since (from my experience with nvidia) those cards using the chipset are made by various OEM's and supply their own custom drivers to suit their derivative (deviate?) video boards..
I seem to recall one particular problem I had at work (around 3 years ago), where I needed DirectX 9 functionallity on my workstation and had major issues with the newly supplied nvidia geforce upgrade (can't remember the model). I seem to recall spending/wasting a few days, just to find the right OEM driver - then the right build that actually worked!
Admittedly the upgrade card was a cheap one @USD$75 at the time, but I wouldn't be surprised if this also occurring with more expensive cards as well..
