Hello,
I just purchased Studio XPS 16, with 4GB RAM DDR3, 1GB ATI HD Radeon 4670, i5 processor..
Is it my laptop good enough to run Assassin Creed 2 at high setting at 1080p?
No, your graphics card is the weak link in that system, mobile graphics cards just aren't very good. You could get it to run, probably by dropping both resolution and details, but 1080p is quite demanding.