i have a problem with splinter cell double agent...please help

[Run_Ma]

i installed the game and when i tried to play it said: crash - trying set a non-registered vertex shader.
does anybody know whats the problem here and how can i fix it??
please help me...

[{I}{K}{E}]

Did you read the .NFO?
What videocard do you have?

[Run_Ma]

my videocard is sapphire ati radeon x800gto 256mb