Nvidia geforce gt 220 crash in game

Hello,
i just wanna ask why my game graphic always crash in middle of the game.My graphic card is nvidia geforce gt220.i already install the latest graphic driver but i still face same problem.i also contact with my local IT for help but they say there is no problem with my computer or my graphic card.And i am apologize for i am really bad in english so if i type wrong pls dun mind it.i am very appreciate if your can help me