If you bought an Alienware X51 then your computer most likely came with Windows 7 and the Nvidia GeForce GTX 555 or another OEM Only Video Card! These graphics cards DO NOT come with compatible drivers for this game and will cause a mini dump every time you try to start the game! There is no way to roll back the drivers or update them normally because these graphics cards drivers are actually managed by Dell and not Nvidia!
THERE IS A SIMPLE FIX THOUGH!!!
Simply go to Nvidia's Driver Website - http://www.geforce.com/drivers - and under Manual Driver Search Select the Following:
GeForce
GeForce 500 Series (assuming you have a GTX 555 or GT 545 or other 500 Series card)
Windows (whichever you have...probably 7)
(language)
Install this driver manually and when it prompts you to restart your computer it will finish installing and your game will work no problem!
What this does is runs your graphics card on the actual Nvidia supported drivers for the 500 Series instead of the specific Dell managed Drivers that are not compatible with this and many other games! It will also mean that when Nvidia releases updates you will automatically get them too instead of having to hope that Dell might some day come out with one!
I am not 100% sure if this will in any way effect warranties or anything like that so please check with Dell first if you are concerned about this. I will in no way be held responsible if it does effect it! 
