Toshiba AMD processor changes/ upgrades to better ones

I own a Toshiba laptop that has a single core AMD processor(2.1GHz and 4 GB ram) so that makes it very difficult for me to play some games like FIFA soccer on my laptop, but i have seen another laptop just like mine with the same shape,size of screen,keyboard,battery and the same hdd size, In fact they look the same but the problem is that other laptop has dual core processors and can play the games i cannot play. I want to ask if i can change my processor to a dual core processor so that i can play the games i want to play?
