Upgrading laptop video card? TF2?

I have a model T6836 Gateway laptop, tried the free TF2 2 weekend but my computers video card isn't really good. its a Graphics media accelerator x3100 384 mb. My computer is a x2 core 2 ghz 4g ram vista 64x. I don't understand why because i can run Half life 2 demo on high settings very smoothly. |||well first off you need to tell me more detail whats wrong with your video card now ...why are you disatisfied?