I can only assume, since it works with an ATi video card. I doubt it's a hardware conflict. I'm pretty sure when AquaMark was released a while back that people with nVIDIA video cards could run it without a problem. Now with the newer drivers, since they've changed quite dramatically, an error will occur. It's kind of like 3DMark99, and even SpeedTree for some. I could run 3DMark99 just fine a while back with my GeForce3, but now with a GeForce4 and the drivers it requires, it says it cannot find DirectX 6 and needs it to run. Of course, we all have DirectX 8. This problem could be AquaMark, but if you ask me it is its incompatibility with nVIDIA's new drivers...