Hi @laughing ,
Have you got the [http://www.dell.com/support/home/au/en/audhs1/product-support/product/alienware-17-laptop/drivers|latest Tobii Eye Tracking Core software] installed? (click in Category box and select Mice, Keyboard & Input Devices).
If it is a hardware problem, here is a link to the [http://topics-cdn.dell.com/pdf/alienware-17-laptop_service%20manual_en-us.pdf|service manual] for your laptop.
Scroll down to p.97 to view the necessary pre-requisite steps and then the procedure to remove the module.