Graphic bug, some help please?

[berty-boy]

Hi all, new to this forum.
Recently purchased The Force Unleashed 2, but can't run it well, because of some wrong graphic bug. The following is all I can see when playing the game.



Would anyone please be so kind to offer some advice in how to make it normal please? I haven't played the first Force Unleashed on my pc, so I don't know if that game works as well
My pc:
Intel(R) Core(TM)2 CPU 6420 @ 2.4GHz
2 GB RAM
Microsoft Windows XP Professional Service Pack 3
Radeon HD4850 1GB

Hope that is all the info you need, many thanks in advance.