I am sorry that we are going with the crowd of modern game requirements.
Oh wait, no. I am not.
If you can't run the game get a better PC. If you can't even run Warband, then something is wrong. 300$ Laptops are not made for gaming, they are made for browsing the internet.
If you only have 300$ to spend, then at least buy a desktop PC, so you get some more performance out of it. But even then you can maybe play games from 2007...
Besides, we haven't even said anything about System requirements yet... They will be rather low, but don't expect any great graphics or super awesome FPS. It will most likely work fine on a 400$ PC, but as I said, don't expect anything too great.