Welcome to the forums,mate.
I,for one,generally don't recommend laptops for a heavy and badly ported game such as GTA:IV,but seeing you have an i7,I might not object.But then again,its all your responsibility if IV screws it up.And I hope you know:
- Laptops aren't as easy to fix as PCs
-GTA:IV might've proved fun on your 360,but its pain in the *** on PC/Laptops and even more while modding as it gets even more unstable with each mod added.
But,no worries.We're here to help you anytime.
Additionally,I'm not seeing any graphic card installed in your set,so I'd recommend you get one.Otherwise,...you know what GTA:IV is.