I agree with the others. The GF4 MX4000 lacks any hardware support whatsoever for DX8.1-compliant vertex and pixel shaders, since it's only a DX7-generation chip to begin with. You'll need full hardware support for DX8.1 in order to even play DeusEX 2 at all. And though the GF3 and GF4 Ti series will play those games at mediocre framerates, now is clearly the time to upgrade that MX4000 to a FX5900 or an R9800Pro.