Error Message: Need Pixel Shader 1.1

[bpurcell]

HP 2600 Athlon
512MB DDR SDRAM
NVidia Geoforce4 MX 64MB

Whenever I try to start demo, I get a message error that says I need a video card that has Pixel Shader 1.1. This is a pretty new card, and I've just updated the video drivers, but I still get the error. How do I check if NVidia has Pixel Shader 1.1, and how do I fix this problem?