cg tutorial examples

Hi! I downloaded Cg Tutorial Examples Installer. exe from the website

Some examples such as C2_green and C3_varing work well. however, the others doesn’t work.
Any body who knows it why it doesn’t work?

I installed cg compiler 1.2

Many thanks in advance!

Best wishes
D.B. Kim

Hardware limitations, perhaps?

What make, model, and driver is your graphics card?