Hi Guilherme,
I am also a mac user (Macbook pro 2,2 Ghz), and I had the same problem as you trying to run games with parallel desktop which is not supporting at all DX.
This is why I suggested you to try to run the game with CrossOver Games from codeweavers.
http://www.codeweavers.com/products/cxgames/
They are supposed to offer the best virtualization for DX games.
Another option, and you should not face any issue with any virtual machine is to run your game on Windows by booting your computer using boot camp.
One last think about your complaint... Metaboli is not responsible for the DRM used for wrapping the game. This decision belongs to the developer or the publisher.
In any case I don't know any PC publisher which will guarantee you a PC game to run on a virtual machine... unfortunately.
