Former

Hi, I just bought a Dell XPS 17, with a 3gb Nvidia GeForce GT 555M card, 8gb ram and an i7 processor , windows 7 home premium, 64 bit operating system, I bought it for sl but its soooooo laggy I can't use it, what's the problem does anyone know, I would have thought this laptop was more than capable of running SL pretty well, please help.