Well, I have a Dell XPS M1330 with 4GB of RAM, Intel core 2 duo T5750 (2.00ghz), and an Nvidia GeForce 8400M GS with 128MB VRAM, and it can run it smoothly for the most part, everything minimum, 800x600. If you just want to play it, then it'll work. If you want it to look nice, it won't.
One option is to make an external GFX card for your laptop, but it isn't exactly the easiest to set up. I'm running an external desktop Radeon 5870. http://forum.notebookreview.com/gaming-software-graphics-cards/418851-diy-vidock-experiences.html