cant play on high settings

hi every one i got an hp g70 laptop and im playing nba 2k9 im just wondering why when i play the game on high settings my game is so slow....so i play the game on low settings can anyone help me pls....

G70 Specs

windows vista
Intel Core duo 2.0
3 GB memory
NVDIA GeForce 9200M GE 1521 MB

thanks a lot