Okay so I really know nothing about computers at all i just like to play games on them...

So, I have an Alienware M11x that I got like 3 years ago (bad computer, ik, but idc). I want to get a new processor, because now games just go extremely slow for no apparent reason and I'm assuming it's the processor. My problem is that I don't know what processor to pick, if it has to be a certain kind, and if it is hard to install.

My current processor is: Genuine Intel (R) CPU U7300 @ 1.30GHz (2 CPUs), ~1.3GHz
I just copied whatever it said on dxdiag.

I was just wondering if someone could recommend something from $60-100 that is better than what I have.