Really interested in playing this game, but can I run it to an enjoyable extent? HP Pavilion dv6 Intel Core i5 M 540 @2.53GHz ATI Mobility Radeon 5650 HD - 1gb vram 4gb DDR3 RAM

I'm extremely interested in playing arma 2, but I see that it appears to be one of the most demanding games on the market. I just bought a laptop for college a couple of month ago, before I really knew about arma 2:mad:. Anyways, will my laptop be able to run this game to any decent extent? I don't want to play on very low graphics, as that is basically pointless. HP Pavilion dv6 Intel Core i5 M 540 @2.53GHz ATI Mobility Radeon 5650 HD - 1gb vram 4gb DDR3 RAM Thanks for any help!