No software is going to give you an fps increase. Have you tried running the game at a higher resolution? If not then do it and check if there is any difference. Also, turn down all eye candy from the in game settings.
Btw, here are the official system requirements for the game - www.game-debate.com/games/index.php?g_id=1099&game=Need%20for%20Speed:%20Hot%20Pursuit
As you can see, your system does require some hardware upgradation.