Have you been able to play other modern games on your laptop? I'm thinking the graphics card built into the laptop simply might not be powerful enough to handle the game, unfortunately.
That particular graphics chipset has been known to not perform too well on more demanding games, even Modern Warfare 2.
Some steps you might take would be to lower some of the settings in the game. Turn off anisotropic filtering, anti-aliasing, anything you can lower to speed up gameplay. Adding RAM to your computer may also help, but I don't think you'll be able to get a completely fluid game out of that laptop sadly.
[Intel Graphics 4500 Benchmarks]
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