Change graphics card for acer aspire 5740?

I'm having Acer Aspire laptop with model 5740 Intel Core i3. It's using Intel GMA HD graphics card but I don't like it because when I play new pc games such as COD or Crysis 2, the games always lag. I want to replace the old one with Nvidia Gefore, but I don't know if I can remove the graphics card of this laptop? Can I change it?