You don't have ShaderModel 1.1 support on your integrated graphics. Pixel Shader and Shader Model are two very different things, they are not interchangeable. If you want to play Splinter Cell 3, you are going to have to get a graphics card. Fortunately for you the game is so old that even the weakest card available today would be able to run the game well.
If you do want to upgrade, post some of your systems specs so we can better make a recommendation. (CPU, RAM, Motherboard, Operating System, Power Supply)