CPU upgrade help

Thanks guys. I have the NVIDIA 240 for a GPU, but the i3 processor that I have isn't cutting it. I wanted to make sure I could upgrade to a quad-core processor. Even the older i7 is better. I cant get any info on the board that's in my laptop from the alienware website because I would have been able to tell what I could use just from that. Thanks for all the help. I just cant believe that this system is so slow....even with 4GB RAM. I expected more from an Alienware system