Do you mean in A6? First; update your drivers, and download the latest 3dgs version....
A lot of these shaders don't show in for example FX Composer, but don't give errors with my dad's Geforce FX 5200, though it doesn't support v.s.2.0... But unfortunately a lot of shaders acquire vertex shader (v.s.) /pixel shader (p.s.) 1.4 or higher.. Your card only supports up to v.s. 1.1 and p.s. 1.3, I believe, and there aren't much shaders around that will work with your card... But did you load the shader into a script action?

Cheers