I'm using Macbook 7,1 (2.4 C2D, 4GB RAM, Nvidia 320M 256mb.) and it runs fine on lowest settings with 30-50FPS (resolution is the one before native)

My only problem is in my mission control I have a Diablo III (Other) folder which inside has Blizzard Error.
My D3 runs fine, does anyone know how tog et rid of this error? Thanks.