So, you found that your laptop allows allocating 128MB of memory to video. Is that right? What do you mean by " pass for game"? And, you say, "ati mobility radeon 9000igp/9100igp video card". You were replying to the question about the system requirements for the game, right? So, the game calls for "ati mobility radeon 9000igp/9100igp video card", which is what your laptop has. Is that correct?
Even so, integrated video never performs as well as a separate video card. So, your laptop simply may not be adequate to play that game.